{"id":62733,"date":"2017-10-25T00:00:00","date_gmt":"2017-10-25T00:00:00","guid":{"rendered":"http:\/\/blog.mozilla.org\/foxtail\/2017\/10\/25\/selena-deckelmann\/"},"modified":"2017-10-25T00:00:00","modified_gmt":"2017-10-25T00:00:00","slug":"selena-deckelmann","status":"publish","type":"post","link":"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/","title":{"rendered":"In the countdown to Firefox Quantum, every millisecond matters to Selena Deckelmann"},"content":{"rendered":"<p>Website pauses, hangs, refreshes and weird jank. If you\u2019ve ever experienced these while browsing the Web, Selena Deckelmann, Director of Firefox Runtime, feels your pain. Her team of 80 software engineers sweats the details of Runtime, the part of Firefox\u2019s hidden infrastructure that interprets a website\u2019s code and makes it show up in your browser. That might sound straight-forward, but it\u2019s highly technical engineering work. Every website in the world is built just a little differently, and the Runtime team knows that if a site shows up funky for Firefox users, some of them will rage quit and blame the browser.<\/p>\n<p>\u201cRuntime is about performance. It\u2019s sink or swim for us,\u201d Deckelmann said. \u201cWe came to a point where we had to really focus on fundamentals, identify exactly what was hurting our performance and execute on fixing it. It wasn\u2019t easy. A lot of engineers \u2014 hundreds \u2014 have been doing a lot of intense work for over a year now.\u201d<\/p>\n<p style=\"text-align: center;\">\/ \/ \/ \/ \/ \/ \/ \/<\/p>\n<p><a title=\"Swifts\" href=\"https:\/\/www.flickr.com\/photos\/bobthebritt\/8017156058\/in\/photolist-dds2bA-8Fgzqg-6YBNmv-9e55kf-p9MWt3-6YBPiB-dds1iB-8E5Z8d-dds1TT-pDhpEw-8FjKC7-8FgyVV-pBwRXW-8FgzoB-8Fgzkz-8FgyZn-6ZBFuA-qiHkxu-8FjKU1-qkAVb3-8Fgzi4-qkHZFn-8FjKDb-8FjKrh-qkBzRG-8FjKMS-6ZxDJR-pFpd98-6ZxEaZ-qxUiHz-7HhfYd-pDhpiQ-6ZxFqH-qwfhoh-pDhn5m-8Fgz4g-qkBAyd-qgXUAh-6ZBG2L-3akCp1-6ZxLmV-pDvK5X-qkKv6k-qvXiKE-8FjKtG-pBLiSp-qgE6tK-pBLig4-pFpcSM-pFpdUM\" data-flickr-embed=\"true\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/farm9.staticflickr.com\/8311\/8017156058_f95b960a9b_b.jpg\" alt=\"Swifts\" width=\"1024\" height=\"1024\" \/><\/a><script async src=\"\/\/embedr.flickr.com\/assets\/client-code.js\" charset=\"utf-8\"><\/script><\/p>\n<p><b>A MASSIVE SWIRL OF TINY BIRDS<\/b> fills the dusk sky over Portland\u2019s Chapman Elementary School as thousands of <a href=\"http:\/\/audubonportland.org\/local-birding\/swiftwatch\">Vaux\u2019s Swifts<\/a> gather to roost for the night while on their fall migration. Sitting on the hillside beside the school amid a crowd of other bird watchers, Selena Deckelmann and her family are mesmerized by the winged display. The birds flit and dive, forming a clockwise spiral that funnels, bird by bird, into the tall brick chimney. The crowd ooohs when lurking Cooper\u2019s Hawks swoop in to snatch an unsuspecting Swift out of mid-flight. The scene overhead is fast-paced, organized chaos, not unlike how Deckelmann finds life at Mozilla.<\/p>\n<p>\u201cThere\u2019s a wonderful thing about working for this place. There\u2019s openness to leadership coming from anywhere in the organization. It doesn&#8217;t have to be someone who has any particular title,\u201d she said. \u201cSometimes that can feel a little chaotic to people who are not accustomed to it. But I like it.\u201d<\/p>\n<p>\u00a0<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/lbxZme2IRZs\" width=\"840\" height=\"473\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>The engineers on her team have been responsible for leading performance improvements at the foundation of Firefox over the last year, painstaking work that is paying off. With the countdown on for <a href=\"https:\/\/www.mozilla.org\/firefox\/quantum\/?utm_source=internet-citizen&#038;utm_medium=blog&#038;utm_campaign=people-of-mozilla&#038;utm_content=selena-deckelmann\">Firefox Quantum<\/a>\u2019s public launch in November, the <a href=\"https:\/\/blog.mozilla.org\/press-uk\/2017\/09\/26\/start-your-engines-firefox-quantum-lands-in-beta-developer-edition\/\">browser\u2019s performance is noticeably faster<\/a>. Deckelmann admitted there was skepticism that the team would achieve their performance goal of 20% parity with Chrome on Speedometer. To get there, the Runtime team took on old, low-priority bugs, ones that didn\u2019t look like they would have clear, immediate impact. Fixing any one of them wouldn\u2019t likely make a significant performance difference, but fixing many of them would.<\/p>\n<p>\u201cWhen it comes to performance, there\u2019s a tendency to look for silver bullets, and we did find a few of those up front that took big bites out of the goal,\u201d said Dave Camp, Senior Director of Firefox Product Engineering and Deckelmann\u2019s boss. \u201cBut one of the things that I\u2019m most proud of is how Selena\u2019s team jumped in together and closed 420-some bugs.\u201d<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignright\" src=\"https:\/\/ffp4g1ylyit3jdyti1hqcvtb-wpengine.netdna-ssl.com\/berlin\/files\/2017\/10\/Clip-9-1-e1508925259781-595x425.jpg\" alt=\"\" width=\"595\" height=\"425\" \/>They shaved a millisecond here, a millisecond there but the Firefox <a href=\"https:\/\/health.graphics\/quantum\/\">performance graph<\/a> hovered at 25% for weeks, below the goal mark. And one day in August, performance crossed over into the green. It was a huge moment in the making.<\/p>\n<p>\u201cThere wasn\u2019t one heroic protagonist who made it all happen,\u201d Deckelmann said. \u201cIt truly was all of these individuals chipping away at a huge problem. I think it\u2019s incredible that our organization took on a problem as huge as our performance.\u201d<\/p>\n<p>Since August, <a href=\"https:\/\/www.mozilla.org\/firefox\/quantum\/?utm_source=internet-citizen&#038;utm_medium=blog&#038;utm_campaign=people-of-mozilla&#038;utm_content=selena-deckelmann\">Firefox Quantum<\/a> has been in the hands of early adopters in the pre-release editions, called <a href=\"https:\/\/www.mozilla.org\/firefox\/channel\/desktop\/?utm_source=internet-citizen&#038;utm_medium=blog&#038;utm_campaign=people-of-mozilla&#038;utm_content=selena-deckelmann\">Firefox Nightly and Beta<\/a>, so that Mozilla engineers can get valuable, real user feedback and continue to improve performance. In September, Firefox Quantum shifted to the Beta version, one step closer to a mass release to the general user base. <a href=\"https:\/\/www.cnet.com\/au\/news\/firefox-quantum-challenges-chrome-in-browser-speed\/\">Reception<\/a> <a href=\"http:\/\/www.zdnet.com\/article\/mozilla-firefox-57-is-so-fast-were-calling-it-firefox-quantum\/\">has been<\/a> <a href=\"https:\/\/thenextweb.com\/tech\/2017\/09\/26\/mozillas-firefox-quantum-browser-is-ridiculously-fast\/#.tnw_9eqml7hY\">positive<\/a> and the numbers are trending up, giving morale a boost and strengthening momentum behind the launch.<\/p>\n<p>\u201cIn my life, this is one of the most exciting transformations in a piece of software that I\u2019ve ever seen,\u201d Deckelmann said. \u201cThese are some of the best people I\u2019ve ever worked with. They are all making the web better. That\u2019s why I came. Everybody here really believes in open source as an important tool for change and good in the world.\u201d<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-extra-large wp-image-589\" src=\"http:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/header-selena-internet-citizen-1000x455.jpg\" alt=\"Selena Deckelmann, Director of Firefox Runtime at Mozilla\" width=\"1000\" height=\"455\" \/><\/p>\n<h2><b>A hacker in the making<\/b><\/h2>\n<p>Deckelmann didn\u2019t set out to have an impact in technology. At the University of Oregon, she declared chemistry as her major, \u201ca cover\u201d for her secret, would-be future as a violinist. Like many students, she also held a part-time job. Hers happened to be at a Dunkin Donuts shop, to the consternation of a housemate who got tired of smelling donuts every day. He suggested she check out an opening at the university computing center where he worked. The job was a turning point. She took to the work, helping people with software installations, virus attacks and hardware failures. Along the way, the college open source community welcomed her into the fold. She eventually built her own computer and worked her way up to being a systems programmer for one of the university staff developers.<\/p>\n<p>\u201cI had this idea that I was going to be a Linux Kernel hacker,\u201d she said with a smile. \u201cThat was my life goal at the time.\u201d<\/p>\n<p>Switching majors to computer science was the next logical step, and initially she didn\u2019t notice how few women were in the CS department compared to chemistry.<\/p>\n<p>\u201cI had the experience in college of going to <a href=\"https:\/\/www.usenix.org\/conferences\/byname\/5\">a conference for system administrators<\/a> and having a woman run up to me and say \u2018I haven\u2019t seen any other women here. You\u2019re the first woman I\u2019ve ever seen.\u2019 It was a really weird moment,\u201d she reflected.<\/p>\n<p>The experience opened her eyes to advocating for more deliberate inclusion, and urging conference organizers to make it clear that women and minorities are not just tolerated, but that they are explicitly wanted at events. A \u201cgeek feminist,\u201d she has long been a proponent of anti-harassment policies and codes of conduct for conferences, talks and gatherings as a signal for clear community standards. For five years, she also advised the <a href=\"https:\/\/adainitiative.org\/\">Ada Initiative<\/a>, an organization (named after <a href=\"https:\/\/adainitiative.org\/about-ada-lovelace\/\">Ada Lovelace<\/a>, the world\u2019s first computer programmer) that was dedicated to supporting women in open technology and culture.<\/p>\n<p>\u201cWomen in our industry are busy. They\u2019re very accomplished, and most of them don\u2019t live in Portland,\u201d she said. \u201cBut those of us who do similar work in open source know each other, even if we\u2019re in different places.\u201d Deckelman worked hard to track them down and develop relationships, something she recommends all women in the field do. She tossed out a quick list of women that she counts as inspiration: Anne Herz, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Audrey_Tang\">Audrey Tang<\/a>, <a href=\"https:\/\/blog.mozilla.org\/webdev\/2012\/04\/06\/better-know-a-webdev-laura-thomson\/\">Laura Thomson<\/a> and <a href=\"https:\/\/en.wikipedia.org\/wiki\/Valerie_Aurora\">Valerie Aurora<\/a>, to name a few.<\/p>\n<p>\u201cA huge motivating force for me is being able to work with other women,\u201d she said. \u201cChanging the system is what drives me to take leadership roles. I want more women to want to work in tech, and especially here at Mozilla and on open source. As flawed as open source is, I think it\u2019s better than the alternative.\u201d<\/p>\n<table>\n<tbody>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-627 size-full\" src=\"http:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/selena-books-595x335.jpg\" alt=\"\" width=\"595\" height=\"335\" \/><\/td>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-626 size-full\" src=\"http:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/women-code-595x335.jpg\" alt=\"\" width=\"595\" height=\"335\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u00a0<\/p>\n<h2><b>Taking it on the Roadshow<\/b><\/h2>\n<p>Since joining Mozilla in 2012, Deckelmann held a variety of roles including crash data analyst and security engineering manager before becoming the Director of Runtime. Still, she often finds herself as the only woman in meetings, and she\u2019d like to see that change.<\/p>\n<p>\u201cIt\u2019s not that Selena is our first female engineering lead, but she is the first woman in upper management in the product engineering org,\u201d Camp said. \u201cI\u2019m happy about that. Having more women contributing is a priority for everyone at Mozilla and everyone on the Firefox team.\u201d<\/p>\n<p>Over the summer, Deckelmann joined Mozilla\u2019s <a href=\"https:\/\/hacks.mozilla.org\/2017\/02\/devroadshow\/?utm_source=mozilla-berlin&#038;utm_medium=blog&#038;utm_campaign=people-of-mozilla&#038;utm_content=selena-deckelmann\">Developer Roadshow<\/a>, a traveling event where expert speakers highlight the latest and best in Mozilla and Firefox technologies. This was her first time out on the roadshow, which was making stops across Seattle to visit with Microsoft, the University of Washington and an informal meetup group in the Pioneer Square neighborhood on this warm Thursday night in August. Deckelmann walked the crowd through the work and achievements of the Runtime team. She dished an alphabet soup of techy acronyms, moving deftly through questions about networking traffic, scheduling algorithms, taskcluster and event queues. Women comprised half the audience, a striking contrast to prior events where the majority of attendees were men.<\/p>\n<p>\u201cPeople came from all over because of Selena,\u201d said Sandra Persing, Senior Program Manager who runs the roadshows. \u201cThey thanked us afterward, telling me they had driven several hours for the event, saying \u2018I have never seen a woman director of engineering.\u2019 That feedback makes us wake up and realize that someone like Selena is still rare, and she makes such an impact on the technical community when she\u2019s out there.\u201d<\/p>\n<table>\n<tbody>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-630 size-full\" src=\"http:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/binocules-595x335.jpg\" alt=\"\" width=\"595\" height=\"335\" \/><\/td>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-629 size-full\" src=\"http:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/soccer-595x335.jpg\" alt=\"\" width=\"595\" height=\"335\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: center;\">\/ \/ \/ \/ \/ \/ \/ \/<\/p>\n<p><b>AS THE SUN FINALLY SETS<\/b> over Chapman Elementary, the last swifts dart into their roosting spot for the night. Deckelmann\u2019s family giggles together, imagining the scene inside the chimney as thousands of birds find space to huddle in harmony. Early the next morning, she\u2019ll be up to feed her backyard chickens before returning to the whirlwind of Firefox engineering.<\/p>\n<p>\u201cPeople at Mozilla are really invested. Companies that inspire that kind of loyalty, that kind of trust&#8230; it is something that makes work amazing, not just worthwhile, but really fulfilling and worth spending your time on,\u201d she said. \u201cI feel a lot of responsibility for it to be a good experience, and I value the trust they put in me.\u201d<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-628 size-full\" src=\"http:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/selena-last-803x525.jpg\" alt=\"\" width=\"803\" height=\"525\" \/><\/p>\n<hr \/>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignleft\" src=\"https:\/\/blog.mozilla.org\/berlin\/files\/2017\/10\/firefox-logo.png\" width=\"150\" height=\"155\" align=\"left\" \/><\/p>\n<h2>The new Firefox is here<\/h2>\n<p>The internet waits for no one, including you. Powered by a new, cutting-edge engine, Firefox has <a href=\"https:\/\/blog.mozilla.org\/firefox\/quantum-performance-test\/?utm_source=mozilla-berlin&#038;utm_medium=blog&#038;utm_campaign=people-of-mozilla&#038;utm_content=selena-deckelmann\">doubled its speed<\/a> from last year.<\/p>\n<p><strong><a href=\"https:\/\/www.mozilla.org\/firefox\/new\/?utm_source=internet-citizen&#038;utm_medium=blog&#038;utm_campaign=people-of-mozilla&#038;utm_term=nick-nguyen\">Get the new Firefox.<\/a> Fast for good.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Website pauses, hangs, refreshes and weird jank. If you\u2019ve ever experienced these while browsing the Web, Selena Deckelmann, Director of Firefox Runtime, feels your pain. Her team of 80 software engineers sweats the details of Runtime, the part of Firefox\u2019s hidden infrastructure that interprets a website\u2019s code and makes it show up in your browser. [&hellip;]<\/p>\n","protected":false},"author":727,"featured_media":20533,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"coauthors":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>People of Mozilla: Selena Deckelmann, Director of Firefox Runtime<\/title>\n<meta name=\"description\" content=\"From Mozilla\u2019s Portland office, Selena Deckelmann leads Runtime, a team of 80 engineers who contributed major performance improvements to Firefox Quantum.\" \/>\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\/en\/firefox\/selena-deckelmann\/\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/\",\"url\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/\",\"name\":\"People of Mozilla: Selena Deckelmann, Director of Firefox Runtime\",\"isPartOf\":{\"@id\":\"https:\/\/blog.mozilla.org\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/A131D055_1709216K_CANON.jpg\",\"datePublished\":\"2017-10-25T00:00:00+00:00\",\"dateModified\":\"2017-10-25T00:00:00+00:00\",\"author\":{\"@id\":\"https:\/\/blog.mozilla.org\/en\/#\/schema\/person\/5c987afc4f606be73692d2acfdd1316c\"},\"description\":\"From Mozilla\u2019s Portland office, Selena Deckelmann leads Runtime, a team of 80 engineers who contributed major performance improvements to Firefox Quantum.\",\"breadcrumb\":{\"@id\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/#primaryimage\",\"url\":\"https:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/A131D055_1709216K_CANON.jpg\",\"contentUrl\":\"https:\/\/blog.mozilla.org\/wp-content\/blogs.dir\/278\/files\/2017\/10\/A131D055_1709216K_CANON.jpg\",\"width\":2201,\"height\":1238},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/blog.mozilla.org\/en\/firefox\/selena-deckelmann\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/blog.mozilla.org\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"In the countdown to Firefox Quantum, every millisecond matters to Selena Deckelmann\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blog.mozilla.org\/en\/#website\",\"url\":\"https:\/\/blog.mozilla.org\/en\/\",\"name\":\"The Mozilla Blog\",\"description\":\"News and Updates about Mozilla\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blog.mozilla.org\/en\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blog.mozilla.org\/en\/#\/schema\/person\/5c987afc4f606be73692d2acfdd1316c\",\"name\":\"M.J. 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