Firefox slow down (stuttering) on reaching 1.5GB memory.

I am having problem with Firefox -- as I keep using it (opening more tabs and stuff) it grows in memory usage. I think there might be leaks somewhere, but that is not by itself a problem -- I have plenty of memory.
However I repeatedly observe that upon reaching approximately 1.5GB of memory usage Firefox starts 'micro stuttering' -- scrolling is nowhere as smooth as it is when it just started, text input is not smooth and so on. This is supremely annoying. Firefox restart completely fixes the issue (until the next time), but it is also not a terribly convenient solution (tabs have to reload next time etc.).
This is observed both on Firefox 24 ESR and Firefox 28. The difference is that Firefox 28 takes much longer to reach 1.5GB barrier (so apparently there have been some optimizations).
I do use a bunch of addons. However disabling them is not really an option because I find 'clean' Firefox pretty much unusable (I'm coming from Opera 12).
I'd like to provide memory reports (from about:memory) however I need to understand how to anonymize them (they appear to contain lots of URLs some of which I'd rather not share).
Can these reports be used to pinpoint misbehaving addon (if there's one)?
Also -- are there 64 bit builds of Firefox 24 or 28? Basically non-alpha stuff with old-style UI? (I've downloaded some kind of alpha 64bit for FF 31 but it looks completely different and I'd rather not deal with it while it's still in alpha)

Ok, I've got annoyed enough by the problem to actually go out of my way and see how it can be reproduced. Turns out -- quite easily.
First of all -- I'm running Windows 7 Home Premium 64 bit with 16Gb of memory with 'classic' desktop (i.e. aero disabled). I'm using Nvidia GTX 760 with desktop extended to two displays (primary 16x10 monitor via DVI and secondary 19x10 TV via HDMI). Scrolling test is performed on the monitor.
Take clean Firefox installation -- specifically I've used FirefoxPortable_29.0.1_English.paf.exe (because I didn't want this experiment to affect anything I'm actually using on my box).
Install two extensions:
- SmoothWheel (AMO) -- this will be used to demonstrate 'stuttering'.
- Flashblock -- this prevents flash stuff from possibly affecting the result.
Configure SmoothWheel (possibly not very relevant, but that's how I can easily see the problem):
- Step size 100 px
- Speed 0.2 sec
- Advanced -> Adaptive step & duration -- > DISABLED
Open page www.exler.ru (yes, it's in russian, but you don't need to actually read it :)). Try scrolling through the page slowly and quickly. Scrolling with SmoothWheel addon should be very smooth and shouldn't result in excessive CPU usage.
Now without closing that page do the following:
- Open rus.delfi.lv in a new tab. It's again in Russian, but I'm using this because it has a crapload of JS and lots of content.
- Open about 25 more tabs from that page -- I'm basically using middle-click to open 25 pages in background.
- Ensure that each of rus.delfi.lv pages is fully loaded -- to do this in each tab do End-Home-End-Home (yes, you need to use 'End' twice).
- Wait for all pages to finish loading.
At this point Process Explorer shows FireFox memory usage of over 1GB on my machine.
Now go back to www.exler.ru page you have opened and try scrolling it.
In my case scrolling is much less smooth -- and quickly scrolling up and down results in a significantly increased CPU usage (unlike when doing this with only one tab open).
Furthermore now if you start closing open rus.delfi.lv tabs one after another, you'll notice a significant delay (freeze) after each page is closed -- until there are only a few pages remaining.
So yes, it looks like there's something seriously wrong somewhere in the innards -- basically if you have a bunch of tabs open something 'breaks' and causes Firefox to perform poorly when either running JS (because SmoothWheel is a JS extension) or when re-drawing/scrolling page (because that's what we are actually doing).
If you close all the rus.delfi.lv pages -- scrolling should go back to normal. But Firefox memory usage remains quite high in my case -- much higher than it is initially with only one tab open.

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