{"id":5650,"date":"2012-11-21T09:35:52","date_gmt":"2012-11-21T17:35:52","guid":{"rendered":"http:\/\/blog.mozilla.org\/addons\/?p=5650"},"modified":"2012-11-21T09:35:52","modified_gmt":"2012-11-21T17:35:52","slug":"firefox-17-compatibility-update","status":"publish","type":"post","link":"https:\/\/blog.mozilla.org\/addons\/2012\/11\/21\/firefox-17-compatibility-update\/","title":{"rendered":"Firefox 17 Compatibility Update"},"content":{"rendered":"

Firefox 17 was released yesterday, and there a couple of notable compatibility issues that have surfaced and are worth pointing out.<\/p>\n

Tab Mix Plus currently incompatible<\/h3>\n

The popular Tab Mix Plus extension is causing some problems for users in Firefox 17. The problems include broken menu items – like the one that opens the Add-ons Manager – and broken links in Firefox windows, like the About dialog.<\/p>\n

This extension broke due to bug 761723<\/a>, and a fixed version hasn’t been released to AMO yet. Apparently there’s a development version of Tab Mix Plus that fixes these issues, so hopefully it will be pushed to the general public soon.<\/p>\n

In the meantime, we recommend users to disable the add-on until the new update is released.<\/p>\n

toString() compatibility warning<\/h3>\n

We ran the automatic compatibility upgrade last week, emailing developers who have add-ons on AMO about their compatibility status. This included a warning for using eval and the Function constructor, since these are often used to monkeypatch Firefox functions, and they most likely broke due to bug 761723<\/a>.<\/p>\n

This is the message that you should see if your add-on was flagged:<\/p>\n

The `toString` implementation for function objects have changed. If you are using `eval` or `Function` to change the behavior of ‘native’ functions, it is probably not working correctly in Firefox 17 and above.<\/p><\/blockquote>\n

Unfortunately, this warning is appearing on many more add-ons that we intended. Notably, it will show up for all add-ons using the jquery library, or any other libraries that use eval of the Function constructor.<\/p>\n

In these cases, you don’t need to worry about the warnings. They’re false positives and can be easily ignored. Also, even if you got a message from us indicating your add-on didn’t pass our compatibility checks, you don’t need to take any action for your add-on to remain compatible with Firefox 17 and above. Because of the Default to Compatible feature, all add-ons remain compatible, even if they don’t pass our checks. However, we always recommend that you test your add-on with every new release and make sure everything still works.<\/p>\n

Binary compatibility briefly broken before release<\/h3>\n

We assure developers of binary add-ons that they can build their binaries based off of the first beta for every Firefox version. This gives them 6 weeks to have their add-ons ready before a new version is released to the public.<\/p>\n

Unfortunately, we overlooked a change that broke binary compatibility in Firefox 17 beta 6. This was reported as bug 813264<\/a> and quickly fixed on Firefox 17 beta 7, which made it to release.<\/p>\n

So, if you built your binary add-on based on the early Firefox 17 betas, you don’t need to do anything. If you built your binaries based on beta 6, you’ll need to rebuild them using beta 7 or the release version. We apologize for the inconvenience, and will look into ways to ensure this doesn’t happen again.<\/p>\n","protected":false},"excerpt":{"rendered":"

Firefox 17 was released yesterday, and there a couple of notable compatibility issues that have surfaced and are worth pointing out. Tab Mix Plus currently incompatible The popular Tab Mix … Read more<\/a><\/p>\n","protected":false},"author":173,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[388,44,581],"tags":[778,278877,278873,12913],"yoast_head":"\nFirefox 17 Compatibility Update - Mozilla Add-ons Community Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.mozilla.org\/addons\/2012\/11\/21\/firefox-17-compatibility-update\/\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jorge Villalobos\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.mozilla.org\/addons\/2012\/11\/21\/firefox-17-compatibility-update\/\",\"url\":\"https:\/\/blog.mozilla.org\/addons\/2012\/11\/21\/firefox-17-compatibility-update\/\",\"name\":\"Firefox 17 Compatibility Update - 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