Firefox 26 on OS X 10.9.1 still has huge memory usuage (leak) which leads to crash

Hi, The subject is sort of self explanatory but for the last few months (not sure exactly when) i have had regular Firefox crashes, it seems to happen when i'm out of memory and FF has used all the available RAM.
I have a MBP with i7 and 8gig of RAM using the latest OSX 10.9.1 and latest FF 26. I always keep up to date with the software.
Usually i have about 20 or so tabs open and go back and forth between these. I have googled and read allot on this topic and most people recommend starting in safe mode, without add-ons , creating clean profile etc and i have done these but slowly i get back into the same issue even after a clean profile....
It seems for every FF update the memory usage increases....back in the day FF was extremely fast and efficient. Or maybe latest FF just wants to remember so much and save just to much old information which leads to these ridiculous amount of memory usage, i tend to go over 3-4gig RAM after half a day alone before it crashes and all my tabs are lost which is extremely frustrating. Is there a way to limit the memory usage?
Only helpful tips i have found so far that seems to remove allot of garbage from the cache and the footprint is going to about:memory and run the "minimize memory usage", this has been working great and so far after 2-3 hours its steady on 900meg (more or less) with 16 tabs open.
Isnt this something FF needs to do regularly to get rid of old stuff ? i saw youtube and many other old stuff in the cache which i was not using and caused FF to go over 2 gig or so before i run this so why isnt this automated? as a user i shouldnt need to care about such thins really. I also used Safari for a few weeks with same amount of tabs and it never goes over 800-900 meg.
I really hope you guys can explain and give me some tips as to how to limit the memory usage of FF and not the regular make a clean profile and generic tips. I really think the problem is FF and nothing else. I done extensive testing here and i'm using just a few add-ons
Adblock plus
All in one Gestures
Swedish dictioanary
Downloadhelper
Screengrab
Download Statusbar
Sorry if i sound irritated but having to lose my tabs daily and being forced to bookmark my tabs constantly just in case FF crashes has been bugging me for a while now and i'm on the verge to switch browser but frankly there is no other browser as good as FF (offering same amount of plugins/add-ons) so i badly want to use FF if possible.
If you need any more info let me know.
Cheers

The attachments / gallery seems to have been playing up recently for some reason.
I note that FlashPlayer 12 is now out. When you start testing I guess it would be best to test with that now.
* Security bulletin: http://helpx.adobe.com/security/products/flash-player/apsb14-02.html
* Release Notes http://helpx.adobe.com/flash-player/release-note/fp_12_air_4_release_notes.html

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