{"id":7844,"date":"2016-06-30T15:59:11","date_gmt":"2016-06-30T22:59:11","guid":{"rendered":"http:\/\/blog.mozilla.org\/addons\/?p=7844"},"modified":"2016-06-30T15:59:11","modified_gmt":"2016-06-30T22:59:11","slug":"compatibility-for-firefox-49","status":"publish","type":"post","link":"https:\/\/blog.mozilla.org\/addons\/2016\/06\/30\/compatibility-for-firefox-49\/","title":{"rendered":"Add-on Compatibility for Firefox 49"},"content":{"rendered":"<p>Firefox 49 will be <a href=\"https:\/\/wiki.mozilla.org\/RapidRelease\/Calendar\">released<\/a> on September 13th. Here&#8217;s the list of changes that went into this version that can affect add-on compatibility. There is more information available in <a href=\"https:\/\/developer.mozilla.org\/en-US\/Firefox\/Releases\/49\">Firefox 49 for Developers<\/a>, so you should also give it a look.<\/p>\n<h3>General<\/h3>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1147981\">Cleanup doorhanger notification anchor ID &amp; class duplication<\/a>. This could affect the styling of add-ons that use popup notifications.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1257887\">Make a window opened through window.open() to be scrollable by default<\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1108382\">Remove non-standard flag argument from <code>String.prototype.{search,match,replace}<\/code><\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=909633\">Remove HTML Microdata API<\/a>.<\/li>\n<\/ul>\n<h3>XPCOM and Modules<\/h3>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1272707\">Limit the size of pref values sent to the child process<\/a>. As a reminder, you shouldn&#8217;t use the preferences service to store large amounts of data. It should only be used for small values (under 4Kb). This bug enforces it for inter-process communication.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1271399\">Need to shim protocol.js move for add-ons<\/a>. The module should now be accessed using<br \/>\n<code>require(\"devtools\/shared\/protocol\")<\/code>. For now, there&#8217;s a shim that permits the old location to be used.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1270808\">Add deprecation warning within nsFaviconService.cpp<\/a>. If you manipulate favicons, you can find the changes <a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1227289#c2\">described in this bug comment<\/a>. After this change you&#8217;ll only see a warning if you don&#8217;t pass the right principal, but eventually it won&#8217;t work as you expect.<\/li>\n<\/ul>\n<p>Let me know in the comments if there&#8217;s anything missing or incorrect on these lists. If your add-on breaks on Firefox 49, I&#8217;d like to know.<\/p>\n<p>The automatic compatibility validation and upgrade for add-ons on AMO will happen in a few weeks, so keep an eye on your email if you have an add-on listed on our site with its compatibility set to Firefox 48.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firefox 49 will be released on September 13th. Here&#8217;s the list of changes that went into this version that can affect add-on compatibility. There is more information available in Firefox &hellip; <a class=\"go\" href=\"https:\/\/blog.mozilla.org\/addons\/2016\/06\/30\/compatibility-for-firefox-49\/\">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":[388,44,295],"tags":[278877,278873,278876,278895],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Add-on Compatibility for Firefox 49 - 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\/2016\/06\/30\/compatibility-for-firefox-49\/\" \/>\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=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.mozilla.org\/addons\/2016\/06\/30\/compatibility-for-firefox-49\/\",\"url\":\"https:\/\/blog.mozilla.org\/addons\/2016\/06\/30\/compatibility-for-firefox-49\/\",\"name\":\"Add-on Compatibility for Firefox 49 - 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