{"id":8157,"date":"2017-05-16T08:26:09","date_gmt":"2017-05-16T15:26:09","guid":{"rendered":"http:\/\/blog.mozilla.org\/addons\/?p=8157"},"modified":"2017-05-16T08:26:35","modified_gmt":"2017-05-16T15:26:35","slug":"compatibility-firefox-55","status":"publish","type":"post","link":"https:\/\/blog.mozilla.org\/addons\/2017\/05\/16\/compatibility-firefox-55\/","title":{"rendered":"Add-on Compatibility for Firefox 55"},"content":{"rendered":"<p>Firefox 55 will be <a href=\"https:\/\/wiki.mozilla.org\/RapidRelease\/Calendar\">released<\/a> on August 8th. 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\/55\">Firefox 55 for Developers<\/a>, so you should also give it a look. Also, if you haven&#8217;t yet, please read our <a href=\"https:\/\/blog.mozilla.org\/addons\/2017\/02\/16\/the-road-to-firefox-57-compatibility-milestones\/\">roadmap to Firefox 57<\/a>.<\/p>\n<h3>General<\/h3>\n<p>Recently, we turned on a restriction on Nightly that <a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1352204\">only allows multiprocess add-ons to be enabled<\/a>. You can use a preference to toggle it. Also, Firefox 55 is the first version to move directly from Nightly to Beta after the <a href=\"https:\/\/hacks.mozilla.org\/2017\/04\/simplifying-firefox-release-channels\/\">removal of the Aurora channel<\/a>.<\/p>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1314861\">Lazily load built-in SDK modules<\/a>. The main change of this bug that could affect developers is that Panel views are loaded when the panel is first shown, rather than when it is created.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1361418\">Remove Java Addons support from Fennec<\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1356922\">Replace the <code>sNextTabParent<\/code> setup with something more robust<\/a>. This mainly affected tab add-ons that use or override <code>openURIInFrame<\/code> and related functions.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1145470\">Remove the <code>hiddenwindow<\/code> special case in <code>CheckLoadURIWithPrincipal<\/code><\/a>. This could affect some add-ons that use the hidden DOM window hack. See <a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1145470#c11\">comment 11<\/a> for details.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1347073\">Get rid of <code>UIEvent.isChar<\/code> because no other browsers support it<\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1329336\">Disable loading remote jars by default<\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1319111\">Expose result principal URL (&#8220;final channel URL&#8221;) on LoadInfo<\/a>. This can affect add-ons that load custom URLs using special protocols (like about:). As you can see if you follow the link, the bug was reopened. Now the developers are considering alternatives to avoid add-on issues.<\/li>\n<\/ul>\n<h3>XPCOM and Modules<\/h3>\n<ul>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=977177\">Move favicons blobs out of <code>places.sqlite<\/code> to their own database<\/a>. This change touches many interfaces, but most adds an optional preferred width argument to some functions (see <a href=\"https:\/\/hg.mozilla.org\/mozilla-central\/rev\/90d755bcbb92#l18.2\">1<\/a> and <a href=\"https:\/\/hg.mozilla.org\/mozilla-central\/rev\/90d755bcbb92#l14.2\">2<\/a>).<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1356023\">Remove <code>nsIScreenManager.systemDefaultScale<\/code><\/a>.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1356810\">Compile subscript loader scripts with <code>noScriptRval<\/code> by default<\/a>. <code>loadSubScript<\/code> no longer returns a value.<\/li>\n<li><a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1338897\">Avoid using NSS Base64 functions in PSM<\/a>. This can affect add-ons that use <code>nsICryptoHash<\/code> or <code>nsICryptoHMAC<\/code>. <a href=\"https:\/\/bugzilla.mozilla.org\/show_bug.cgi?id=1338897#c8\">See comment 8<\/a> for details.<\/li>\n<\/ul>\n<p>Let me know in the comments if there&#8217;s anything missing or incorrect on these lists. We&#8217;d like to know if your add-on breaks on Firefox 55.<\/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 54.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firefox 55 will be released on August 8th. 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\/2017\/05\/16\/compatibility-firefox-55\/\">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":[278877,278873,278876,45292,288925,278871],"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 55 - 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\/2017\/05\/16\/compatibility-firefox-55\/\" \/>\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\/2017\/05\/16\/compatibility-firefox-55\/\",\"url\":\"https:\/\/blog.mozilla.org\/addons\/2017\/05\/16\/compatibility-firefox-55\/\",\"name\":\"Add-on Compatibility for Firefox 55 - 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