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Re:Show HN: Where Adblock+ injects 20K CSS rules, HTTPSB inj... by cpeterso on Monday May 19, 2014 @03:25AM (#7766143)
Firefox is adding "add-on compartments" (bug 990729) that allocate separate memory arenas for each add-on. Firefox will be able to use this information to track (most) memory usage for each add-on.

https://bugzilla.mozilla.org/show_bug.cgi?id=990729

Re:Show HN: Where Adblock+ injects 20K CSS rules, HTTPSB inj... by nnethercote on Monday May 19, 2014 @03:34AM (#7766173)
It can already measure some parts of add-on memory usage, and you can see this by looking for "add-ons" in about:memory. Bug 990729 will improve the accuracy of the measurements.
Re:Show HN: Where Adblock+ injects 20K CSS rules, HTTPSB inj... by Spittie on Monday May 19, 2014 @04:38AM (#7766381)
There is also this addon (https://addons.mozilla.org/en-us/firefox/addon/about-addons-...) which has a somewhat nicer interface.