Latest update makes firefox so slow it's unusable

after yet another ff crash, I forced an update to the latest release today. THAT was a mistake. Before, ff was simply unstable. Now it's so slow it's unusable. It's like running Windows 8 on an IBM XT.
Given that I'm running Win7 on an Intel i7 3770 w/16gb of RAM, and a loaded graphics card, pretty sure that I'm not the problem.
You guys REALLY need to fix the stability. I'm having to use Chrome to write this, since FF is so unusable right now.

I have the same exact problem. I'm a firefox user since the first version, and always have experienced ups & downs in performance and stability.
Latest releases result in too much instability (at least 2 or 3 daily crashes) up to v29.
With v30.0 the problems are aggravated:
Crashes continue, but now there are huge memory leaks and sluggish user experience (it freezes for a fraction of a second every 2 seconds!!!)
This happens after some time (hours?) after a fresh start (that i MUST do every couple of hours to make it usable).
Firefox is going the wrong way...

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