Lex, sorry for the misunderstanding. You are right about my original post having outdated OS information. I changed it AFTER that post and had forgotten that was the case. I can try turning extension off and then on one at a time, but I don't know when I'll be able to get around to it since I use several of my extension for work, and doing so will require me to use Safari long enough after each turn-on to build up to WebProcess' memory leak (or long enough to be sure the leak isn't happening).
Since you say you're having the same problems, I take it you've tried this already? Did you have any success?
I would love to help solve the problem. I'm not "running away" to Chrome either, which is why I'm here as well. I've just resorted to using Chrome as my daily driver until Apple releases a fix. (Wouldn't it be nice if they acknowledged the problem so we could at least be assured that fix is on the way?)
FYI, my extensions are...
Firebug Lite
Click-to-Flash (already tried turning this off, didn't help)
TinEye (tried running without this too)
ImgurUploader (tried turning this off)
Awesome Screenshot (haven't tried without this one yet, need it for work)
JavaScript Blacklist (tried turning this off)
HoverZoom (tried turning this off)
LessIMDb (site-specific, haven't tried turning this off)
AdBlock (tried turning this off)
KachingleX (my company's extension, which is on and off all the time since I'm the QA guy)
So now that I look at this list, it seems I have tried Safari with most of these off after all!
Thanks for offering the 5.0.5/6 link. I may take you up on that, but not just yet — there are dangers to downgrading, are their not? What with Safari being closely meshed with the OS?