Alexandre Poirot fixed a leak in the Add-on SDK<\/a> that was causing zombie compartments when certain add-ons were disabled.\u00a0 This also fixed bug 725603<\/a> and probably fixes some zombie compartments reported in some other add-ons (e.g. MemChaser<\/a>).<\/p>\n Jan fixed several leaks in the Galaxytoolbar add-on<\/a>.\u00a0 The new version is 2.6.12.<\/p>\n A small number of add-ons have been found that disable Firefox’s XUL cache<\/a>.\u00a0 This is a recipe for disastrous performance, and so Matt Basta updated the AMO add-on validator to detect this<\/a>.<\/p>\n I landed support for a new page called about:compartments<\/a>. The exposure of zombie compartments in about:memory has become an extremely powerful leak detection tool.\u00a0 But using about:memory to find zombies is non-trivial — there are multiple steps and ways to get it wrong.\u00a0 The motivation for about:compartments is to make the detection of zombie compartments as simple as possible.\u00a0 Here’s a screenshot:<\/p>\n Some things to note:<\/p>\n Olli Pettay created about:cc<\/a>, an add-on that can detect various kinds of document leaks relating to cycle collection.\u00a0 Olli has already found several leaks<\/a> with this tool.\u00a0 Jan Honza Odvarko has written about:ccdump<\/a>, a similar but prettier add-on.\u00a0 I’m not certain but I think Olli and Jan are now co-ordinating their efforts.<\/p>\n I mentioned Mozilla QA’s MemChaser add-on a few weeks ago.\u00a0 It lets you track memory usage and GC\/CC activity easily via the add-on bar, and also allows logging of memory-related activities.\u00a0 It’s now available on AMO<\/a>, which guarantees you’ll receive updates as they’re released.<\/p>\n Jesse Ruderman tweaked his DOM fuzzer and found several new small leaks relating to nsITimers.\u00a0 Jesse also modified about:memory so that it produces assertions that his fuzzer will catch<\/a>.\u00a0 This means that his fuzzer will detect if any memory reporters produce bogus values.<\/p>\n Kyle Huey fixed a zombie compartment that occurred when searching within pages with onclick handlers<\/a>, which is a pretty common operation.<\/p>\n Jeff Muizelaar fixed a huge Mac-only leak relating to text rendering<\/a>.\u00a0 This was a recent regression that isn’t present in any released version of Firefox.<\/p>\n Josh Aas fixed a bug in cookie clearing<\/a> — prior to Josh’s fix, if you cleared all cookies, Firefox would launch an instance of the plugin-container process for every plug-in installed, which could cause freezes and memory spikes.<\/p>\n Andrew Quartey updated the WebGL memory reporters<\/a> to the new style<\/a>.<\/p>\n This week\u2019s bug counts:<\/p>\n Lots of movement there:\u00a0 plenty of bugs fixed, but even more new ones.\u00a0 Roughly 20 of the new ones fell into the following three categories.<\/p>\n This is a good thing!\u00a0 It shows that new policies and tools are exposing existing problems.\u00a0 I expect this higher level of new bug filing will continue for a couple of weeks.<\/p>\n","protected":false},"excerpt":{"rendered":" Lots of activity this week. Leaky add-ons I created a new devmo wiki page documenting common causes of memory leaks in add-ons.\u00a0 I based this on a lovely selection of examples provided by Nils Maier.\u00a0 Unfortunately, I know almost nothing about writing add-ons and so I’m not happy with the current state of the documentation.\u00a0 […]<\/p>\n","protected":false},"author":139,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15267,4550,119,4554,30,4544,4546],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/posts\/1782"}],"collection":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/users\/139"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/comments?post=1782"}],"version-history":[{"count":0,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/posts\/1782\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/media?parent=1782"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/categories?post=1782"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/tags?post=1782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Tools<\/h3>\n
![\"about:compartments](\"http:\/\/blog.mozilla.org\/nnethercote\/files\/2012\/02\/compartments.png\" "\\"compartments\\"")
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Miscellaneous<\/h3>\n
Bug counts<\/h3>\n
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