Friend of Add-ons: Shivam Singhal

Please meet our newest Friend of Add-ons, Shivam Singhal! Shivam became involved with the add-ons community in April 2017. Currently, he is an extension developer, Mozilla Rep, and code contributor to (AMO). He also helps mentor good-first-bugs on AMO.

“My skill set grew while contributing to Mozilla,” Shivam says of his experiences over the last two years. “Being the part of a big community, I have learned how to work remotely with a cross-cultural team and how to mentor newbies. I have met some super awesome people like [AMO engineers] William Durand and Rebecca Mullin. The AMO team is super helpful to newcomers and works actively to help them.”

This year, he’s looking forward to submitting patches to the WebExtensions API and Add-ons Manager in Firefox, and mentoring more new code contributors. Shivam has advice for anyone who is interested in contributing to Mozilla’s add-ons projects. “If you are shy or not feeling comfortable commenting on an issue, you can fill out the add-ons contributor survey and someone will help you get started. That’s what I did. You can also check for other ways to get involved.”

In his free time, Shivam enjoys watching stand-up comedy and sci-fi web series, exploring food at cafes, and going through pull requests on the AMO frontend repository.

Thanks for all of your contributions, Shivam! Your enthusiasm for the add-ons ecosystem is contagious, and it’s been a pleasure watching you grow.

To learn more about how to get involved with the add-ons community, check out our Contribute wiki.

January’s featured extensions

Firefox Logo on blue background

Pick of the Month: Auto Tab Discard

by Richard Neomy
Save memory usage by automatically hibernating inactive tabs.

“Wow! This add-on works like a charm. My browsing experience has improved greatly.”

Featured: Malwarebytes Browser Extension

by Malwarebytes Inc.
Enhance the safety and speed of your browsing experience by blocking malicious websites like fake tech support scams and hidden cryptocurrency miners.

“Malwarebytes is the best I have used to stop ‘Microsoft alerts’ and ‘Windows warnings’.”

If you’d like to nominate an extension for featuring, please send it to amo-featured [at] mozilla [dot] org for the board’s consideration. We welcome you to submit your own add-on!

Extensions in Firefox 65

In lieu of the normal, detailed review of WebExtensions API coming out in Firefox 65, I’d like to simply say thank you to everyone for choosing Firefox. Now, more than ever, the web needs people who consciously decide to support an open, private, and safe online ecosystem.

Two weeks ago, nearly every Mozilla employee gathered in Orlando, Florida for the semi-annual all-hands meeting.  It was an opportunity to connect with remote teammates, reflect on the past year and begin sharing ideas for the upcoming year. One of the highlights was the plenary talk by Mitchell Baker, Chairwoman of the Mozilla Foundation. If you have not seen it, it is well worth 15 minutes of your time.

Mitchell talks about Firefox continually adapting to a changing internet, shifting its engagement model over time to remain relevant while staying true to its original mission. Near the end, she notes that it is time, once again, for Mozilla and Firefox to evolve, to shift from being merely a gateway to the internet to being an advocate for users on the internet.

Extensions will need to be part of this movement. We started when Firefox migrated to the WebExtensions API (only a short year ago), ensuring that extensions operated with explicit user permissions within a well-defined sandbox. In 2018, we made a concerted effort to not just add new API, but to also highlight when an extension was using those API to control parts of the browser. In 2019, expect to see us sharpen our focus on user privacy, user security, and user agency.

Thank you again for choosing Firefox, you have our deepest gratitude and appreciation. As a famous Mozillian once said, keep on rockin’ the free web.

-Mike Conca

Highlights of new features and fixes in Firefox 65:

A huge thank you to the community contributors in this release, including: Ben Armstrong, Oriol Brufau, Tim Nguyen, Ryan Hendrickson, Sean Burke, Yuki “Piro” Hiroshi, Diego Pino, Jan Henning, Arshad Kazmi, Nicklas Boman.


December’s Featured Extensions

Firefox Logo on blue background

Pick of the Month: Full Screen for Firefox

by Stefan vd
Go full screen with a single click.

“This is what I was searching for and now I have it!”

Featured: Context Search

by Olivier de Broqueville
Search highlighted text on any web page using your preferred search engine. Just right-click (or Shift-click) on the text to launch the context menu. You can also perform searches using keywords in the URL address bar.

“Great add-on and very helpful! Thank you for the good work.”

Featured: Behind the Overlay Revival

by Iván Ruvalcaba
Simply click a button to close annoying pop-up overlays.

“I don’t think I’ve ever reviewed an extension, but man, what a find. I get very sick of closing overlays and finding the little ‘x’ in some corner of it or some light colored ‘close’ link. They get sneakier and sneakier about making you actually read the overlay to find a way to close it. Now when I see one, I know right away I can click on the X in the toolbar and it will disappear. So satisfying.”

If you’d like to nominate an extension for featuring, please send it to amo-featured [at] mozilla [dot] org for the board’s consideration. We welcome you to submit your own add-on!

Extensions in Firefox 64

Following the explosion of extension features in Firefox 63, Firefox 64 moved into Beta with a quieter set of capabilities spread across many different areas.

Extension Management

The most visible change to extensions comes on the user-facing side of Firefox where the add-ons management page (about:addons) received an upgrade.

Changes on this page include:

  • Each extension is shown as a card that can be clicked.
  • Each card shows the description for the extension along with buttons for Options, Disable and Remove.
  • The search area at the top is cleaned up.
  • The page links to the Firefox Preferences page (about:preferences) and that page links back to about:addons, making navigation between the two very easy.  These links appear in the bottom left corner of each page.

These changes are part of an ongoing redesign of about:addons that will make managing extensions and themes within Firefox simpler and more intuitive. You can expect to see additional changes in 2019.

As part of our continuing effort to make sure users are aware of when an extension is controlling some aspect of Firefox, the Notification Permissions window now shows when an extension is controlling the browser’s ability to accept or reject web notification requests.

When an extension is installed, the notification popup is now persistently shown off of the main (hamburger) menu.  This ensures that the notification is always acknowledged by the user and can’t be accidentally dismissed by switching tabs.

Finally, extensions can now be removed by right-clicking on an extension’s browser action icon and selecting “Remove Extension” from the resulting context menu.

Even More Context Menu Improvements

Firefox 63 saw a large number of improvements for extension context menus and, as promised, there are even more improvements in Firefox 64.

The biggest change is a new API that can be called from the contextmenu DOM event to set a custom context menu in extension pages.  This API, browser.menus.overrideContext(), allows extensions to hide all default Firefox menu items in favor of providing a custom context menu UI.  This context menu can consist of multiple top-level menu items from the extension, and may optionally include tab or bookmark context menu items from other extensions.

To use the new API, you must declare the menus and the brand new menus.overrideContext permission. Additionally, to include context menus from other extensions in the tab or bookmarks contexts, you must also declare the tabs or bookmarks permissions, respectively.

The API is still being documented on MDN at the time of this writing, but the API takes a contextOptions object as a parameter, which includes the following values:

  • showDefaults: boolean that indicates whether to include default Firefox menu items in the context menu (defaults to false)
  • context: optional parameter that indicates the ContextType to override to allow menu items from other extensions in this context menu. Currently, only bookmark and tab are supported. showDefaults cannot be used with this option.
  • bookmarkId: required when context is bookmark. Requires bookmarks permission.
  • tabId: required when context is tab. Requires tabs permission.

While waiting for the MDN documentation to go live, I would highly encourage you to check out the terrific blog post by Yuki “Piro” Hiroshi that covers usage of the new API in great detail.

Other improvements to extension context menus include:

  • browser.menus.update() now allows extensions to update an icon without having to delete and recreate the menu item.
  • menus.create() and menus.update() now support a viewTypes property.  This is a list of view types that specifies where the menu item will be shown and can include tab, popup (pageAction/browserAction) or sidebar. It defaults to any view, including those without a viewType.
  • The menus.onShown and menus.onClicked events now include the viewType described above as part of their info object so extensions can determine the type of view where the menu was shown or clicked.
  • The menus.onClicked event also added a button property to indicate which mouse button initiated the click (left, middle, right).

Minor Improvements in Many Areas

In addition to the extension management in Firefox and the context menu work, many smaller improvements were made throughout the WebExtension API.

Page Actions

  • A new, optional manifest property for page actions called ‘pinned’ has been added.  It specifies whether or not the page action should appear in the location bar by default when the user installs the extension (default is true).


Content Scripts

  • Content scripts can now read from a <canvas> that they have modified.


Private Browsing

Keyboard Shortcuts

Dev Tools

  • Extensions can now create devtools panel sidebars and use the new setPage() API to embed an extension page inside the devtools inspector sidebar.

Misc / Bug Fixes

Thank You

A total of 73 features and improvements landed as part of Firefox 64. Volunteer contributors were a huge part of this release and a tremendous thank you goes out to our community, including: Oriol Brufau, Tomislav Jovanovic, Shivam Singhal, Tim Nguyen, Arshad Kazmi, Divyansh Sharma, Tom Schuster, Tim B, Tushar Arora, Prathiksha Guruprasad. It is the combined efforts of Mozilla and our amazing community that make Firefox a truly unique product. If you are interested in contributing to the WebExtensions ecosystem, please take a look at our wiki.

Friend of Add-ons: Jyotsna Gupta

Our newest Friend of Add-ons is Jyotsna Gupta! Jyotsna first became involved with Mozilla in 2015 when she became a Firefox Student Ambassador and started a Firefox club at her college. She has contributed to several projects at Mozilla, including localization, SuMo, and WebMaker, and began exploring Firefox OS app development after attending a WoMoz community meetup in her area.

In 2017, a friend introduced Jyotsna to browser extension development. Always curious and interested in trying new things, she created PrivateX, an extension that protects user privacy by opening websites that ask for critical user information in a private browsing window and removing Google Analytics tracking tokens. With her newfound experience developing extensions, Jyotsna began mentoring new extension developers in her local community, and joined the Featured Extensions Advisory Board.

After wrapping up two consecutive terms on the board, she served on the judging panel for the Firefox Quantum Extensions Challenge, evaluating more than 100 extensions to help select finalists for each award category. Currently, she is an add-on content reviewer on and a Mozilla Rep. She frequently speaks about cross-browser extension development at regional events.

When asked about her experience contributing to Mozilla, Jyotsna says, “It has been a wonderful learning experience for me as a Mozillian. When I was a student, Mozilla was something that I could add to my profile to enhance my resume. There was a time when I refrained myself from speaking up, but today, I’m always ready to speak in front of a huge number of people. Getting involved with Mozilla helped me in meeting like-minded people around the globe, working with diverse teams, learned different cultures, gained global exposure and a ton of other things. 
And I’m fortunate enough to have wonderful mentors around me, boosting me up to see a brighter side in every situation.”

Jyotsna also has advice for newcomers to open source projects. “To the contributors who are facing imposter syndrome, trust me, you aren’t alone. We were all there once. We are here for you. May the force be with you.”

Thank you so much for your many wonderful contributions, Jyotsna!

To learn more about how to get involved in the add-ons community, please take a look at our wiki to see current contribution opportunities.

November’s Featured Extensions

Firefox Logo on blue background

Pick of the Month: Undo Close Tab

by Manuel Reimer
Access recently closed tabs by right-clicking the icon in your toolbar.

“The extension does exactly what is stated: it restores tabs, and not just the last one closed, but up to 25 recent tabs.”

Featured: Lilo

by Lilo
Help fund social and environmental causes by simply using Lilo search.

“Very positive. This engine allows us to help in a concrete way without any effort or money.”

Featured: SoundFixer

Adjust the gain and pan levels for almost any audio you encounter on the web.

“Wonderful – so many videos I like are so low I can’t hear them at all. This really, really works! Yay!”

If you’d like to nominate an extension for featuring, please send it to amo-featured [at] mozilla [dot] org for the board’s consideration. We welcome you to submit your own add-on!

Firefox, Chrome and the Future of Trustworthy Extensions

Browser extensions are wonderful. Nearly every day I come across a new Firefox extension that customizes my browser in some creative way I’d never even considered. Some provide amusement for a short time, while others have become indispensable to my work and life. Extensions are a real-world manifestation of one of Mozilla’s core principles — that individuals must have the ability to shape the internet and their experiences on it.

Another of Mozilla’s core principles is that an individual’s security and privacy on the internet are fundamental and must not be treated as optional. We’ve made the decision to support extensions, but it is definitely a balancing act. Our users’ freedom to customize their browser – their “user agent” – and to personalize their experience on the web can also be exploited by malicious actors to compromise users’ security and privacy.

At Mozilla, we continually strive to honor both principles. It’s why Firefox extensions written to the WebExtensions API are limited in their abilities and have good oversight, including automatic and manual review. It’s also why we make sure users can understand exactly what permissions they’ve granted to those extensions and what parts of their browser they can access.

In short, Mozilla makes every effort to ensure that the extensions we offer are trustworthy.

So it was with great interest that I read Google’s recent Chromium Blog blog post entitled “Trustworthy Chrome Extensions, by default.” It outlines upcoming changes to Chrome’s extension architecture designed to make “extensions trustworthy by default.” I thought it would be interesting to explore each of the announced changes and compare them to what Mozilla has built into Firefox.

User Controls for Host Permissions

“Beginning in Chrome 70, users will have the choice to restrict extension host access to a custom list of sites, or to configure extensions to require a click to gain access to the current page.”

Being able to review and modify the sites that an extension has access to, especially those extensions that ask to “access your data for all websites,” is a worthy goal. Mozilla has discussed similar ideas, but the problem always comes down presenting this in a clear, uncomplicated way to a majority of users.

Having played a bit with this feature in Chrome, the implementation definitely seems targeted at power users. Extensions that request access to all websites still get installed with that access, so the default behavior has not changed.

The click-to-script option is intriguing, although the UX is a bit awkward. It’s workable if you have a single extension, but becomes unwieldy to click and reload every site visited for every installed extension.

Admittedly, getting this interface right in an intuitive and easy-to-use manner is not straightforward and I applaud Google for taking a shot at it. Meanwhile Mozilla will continue to look for ways Firefox can provide more permission control to a majority of extension users.

Extension Review Process

“Going forward, extensions that request powerful permissions will be subject to additional compliance review.”

The post is vague about exactly what this means, but it likely means these extensions will be flagged for manual review. This brings Chrome up to the standard that Firefox set last year, which is great news for the web. More manual review means fewer malicious extensions.

“We’re also looking very closely at extensions that use remotely hosted code, with ongoing monitoring.”

Firefox expressly forbids remotely hosted code. Our feeling is that no amount of review can eliminate the risks introduced when developers can easily and undetectably change what code is loaded by extensions. Mozilla’s policy ensures that no unreviewed code is ever loaded into the browser, and enforced signatures prevents reviewed code from being altered after release.

Code Readability Requirements

“Starting today, Chrome Web Store will no longer allow extensions with obfuscated code…minification will still be allowed.”

In reality, minified and obfuscated code are not very useful in extensions. In both Chrome and Firefox, extensions load locally (not over the network) so there is almost no performance advantage to minification, and obfuscation can be overcome by a dedicated person with readily available tools and sufficient effort.

Nevertheless, Mozilla permits both obfuscated and minified extensions in our store. Critically, though, Mozilla requires all developers to submit original, non-obfuscated, non-minified code for review, along with instructions on how to reproduce (including any obfuscation or minification) the store version. This ensures that reviewers are able to review and understand every extension, and that the store version is unaltered from the reviewed version.

As you might expect, this takes a significant investment of time and energy for both Mozilla and developers. We believe it is worth it, though, to allow developers to secure their code, if desired, while simultaneously providing thoroughly reviewed extensions that maintain user security and privacy.

Required 2-Step Verification

As a whole, the web is moving in this direction and requiring it for developer accounts is a strong step towards protecting users. Mozilla recently added two-step authentication for Firefox Sync accounts, and two-step authentication for Firefox extension developers is on the roadmap for the fourth quarter of 2018. Like Google, we expect to have this feature enabled by 2019.

Manifest v3

“In 2019 we will introduce the next extensions manifest version…We intend to make the transition to manifest v3 as smooth as possible and we’re thinking carefully about the rollout plan.”

In 2015, Mozilla announced we were deprecating our extremely popular extension system in favor of WebExtensions, an API compatible with Chrome, as well as Edge and Opera. There were several reasons for this, but a large part of the motivation was standards — a fundamental belief that adopting the API of the market leader, in effect creating a de facto standard, was in the best interests of all users.

It was a controversial decision, but it was right for the web and it represents who Mozilla is and our core mission. Three years later, while there still isn’t an official standard for browser extensions, the web is a place where developers can quickly and easily create cross-browser extensions that run nearly unchanged on every major platform.

So I would like to publicly invite Google to collaborate with Mozilla and other browser vendors on manifest v3. It is an incredible opportunity to show that Chrome embodies Google’s philosophy to “focus on the user,” would reaffirm the Chrome team’s commitment to open standards and an interoperable web, and be a powerful statement that working together on the future of browser extensions is in the best interests of a healthy internet.


While all of the changes Google outlined are interesting, some of them could go a step further in protecting users online. Nevertheless, I’d like say — bravo! The motivation behind these changes is definitely in the spirit of Mozilla’s mission and a gain for the open web. With Chrome’s market share, these initiatives will have a positive impact in protecting the security and privacy of millions of users around the world, and the web will be a better place for it.

A lot of work remains, though. Expect Mozilla to keep fighting for users on the web, launching new initiatives, like Firefox Monitor, to keep people safe, and advancing Firefox to be the best user agent you can have in your online journies.

Apply to Join the Featured Extensions Advisory Board

Do you love extensions? Do you have a keen sense of what makes a great extension? Want to help users discover extensions that will improve how they experience the web? If so, please consider applying to join our Featured Extensions Community Board!

Board members nominate and select new featured extensions each month to help millions of users find top-quality extensions to customize their Firefox browsers. Click here to learn more about the duties of the Featured Extension Advisory Board. The current board is currently wrapping up their six-month tour of duty and we are now assembling a new board of talented contributors for the months January – June, 2019.

Extension developers, designers, advocates, and fans are all invited to apply to join the board. Priority will be given to applicants who have not served on the board before, followed by those from previous boards, and finally from the outgoing board.

To apply, please send us an email at amo-featured [at] mozilla [dot] org with your name and a few sentences about how you’re involved with AMO and why you are interested in joining the board. The deadline is Monday, October 22, 2018 at 11:59pm PDT. The new board will be announced shortly thereafter.

We look forward to hearing from you!

October’s Featured Extensions

Firefox Logo on blue background

Pick of the Month: Default Bookmark Folder

by Teddy Gustiaux
Do you keep multiple bookmark folders? This extension makes it simple to add new bookmarks to specific folders.

“So useful and powerful. I no longer have to change bookmark locations every time!”

Featured: Search Site WE

by DW-dev
Perform website-specific searches.

“Fast, very cool & useful.”

Featured: Dark Reader

by Alexander Shutov
Turn the entire web dark. This extension inverts bright colors to make all websites easier on the eyes.

“This is hands down the best looking dark theme extension for Firefox that I have tried.”

Featured: Vertical Tabs Reloaded

by Croydon
Arrange your open tabs in an orderly vertical stack.

“This is great. Vertical tabs should be the standard nowadays.”

Featured: Text MultiCopy

by erosman
Save multiple snippets of text to paste and organize later.

“So very useful and it works flawlessly.”

Featured: Cookiebro

by Nodetics
Simple yet powerful cookie management. Automatically deletes unwanted cookies, while sparing those on your whitelist.

“I really like that Cookiebro recognizes session cookies, so deleting unwanted cookies will still keep you logged in on most sites.”

If you’d like to nominate an extension for featuring, please send it to amo-featured [at] mozilla [dot] org for the board’s consideration. We welcome you to submit your own add-on!