{"id":7198,"date":"2014-07-03T13:02:44","date_gmt":"2014-07-03T20:02:44","guid":{"rendered":"http:\/\/blog.mozilla.org\/addons\/?p=7198"},"modified":"2014-07-03T13:02:44","modified_gmt":"2014-07-03T20:02:44","slug":"compatibility-for-firefox-31","status":"publish","type":"post","link":"https:\/\/blog.mozilla.org\/addons\/2014\/07\/03\/compatibility-for-firefox-31\/","title":{"rendered":"Add-on Compatibility for Firefox 31"},"content":{"rendered":"<p>Firefox 31 will be <a href=\"https:\/\/wiki.mozilla.org\/RapidRelease\/Calendar\">released<\/a> on July 22nd. 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\/31\">Firefox 31 for Developers<\/a>, so you should read that too.<\/p>\n<h3>General<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=865826\">Remove the browser.tabs.closeButtons pref<\/a><\/strong>. This pref used to determine if there should be close buttons per tab, only on the active tab, or at the end of the tab bar.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=989984\"><code>getShortcutOrURIAndPostData<\/code> should have a synchronous callback behavior<\/a>. Instead of returning a promise, now it takes a second callback argument.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=939323\">Warn about XMLHttpRequest sendAsBinary usage<\/a>. This is only a warning, but you should consider this function to be deprecated. There are various other ways to send binary data, like setting the content type header or using a Blob.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=997131\">Simplify conditional forward button CSS by making the forward button a direct sibling of the location bar<\/a>. This might interest theme developers.<\/li>\n<\/ul>\n<h3>Content<\/h3>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=980134\">Hide <code>DataContainerEvent<\/code> from content<\/a>. <code>MessageEvent<\/code> or <code>CustomEvent<\/code> can be used instead.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=983845\">Stop exposing BrowserFeedWriter to the Web<\/a>.<\/li>\n<\/ul>\n<h3>XPCOM<\/h3>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=754265\">Add a dedicated API to provide a final complete value different from the matching one<\/a>. If you implement an autocomplete provider in your extension, you will need to add a new function called\u00a0<code>getFinalCompleteValueAt<\/code>. There are examples of this in <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/How_to_implement_custom_autocomplete_search_component\">this MDN article<\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=944557\">Remove the state string from sessionstore-state-write<\/a>.<\/li>\n<\/ul>\n<h3>New!<\/h3>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=957833\">Ship CSS Variables (that is, enable the preference)<\/a>. More info about <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Using_CSS_variables\">CSS Variables on MDN<\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=966674\">Add a Log.Logger API for logging exceptions\/errors<\/a>.<\/li>\n<\/ul>\n<p>Please let me know in the comments if there&#8217;s anything missing or incorrect on these lists. If your add-on breaks on Firefox 31, I&#8217;d like to know.<\/p>\n<p>The automatic compatibility validation and upgrade for add-ons on AMO will happen soon, so keep an eye on your email if you have an add-on listed on our site with its compatibility set to Firefox 30.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firefox 31 will be released on July 22nd. 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\/2014\/07\/03\/compatibility-for-firefox-31\/\">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":[278877,278873,278876,325],"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 31 - 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\/2014\/07\/03\/compatibility-for-firefox-31\/\" \/>\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\/2014\/07\/03\/compatibility-for-firefox-31\/\",\"url\":\"https:\/\/blog.mozilla.org\/addons\/2014\/07\/03\/compatibility-for-firefox-31\/\",\"name\":\"Add-on Compatibility for Firefox 31 - 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