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I have 3 tabs pinned, no others, maximized and the browser left on all day. Things tend to start to deteriorate after day 2. (1) Google Inbox (no reload), (2) gaming.SE Home (15min reload), (3) SO Home (5min reload). Tab reloading is done via Tab Mix Plus. I'm not watching about:memory, but memory usage in task manager. Memory without it sits at 700MB. With, it rises to about 1GB after a day, 1.5GB after about two, then things start to fail at around 2.5GB usage.
I can't say this conclusively yet since I've had to restart a couple of times and couldn't have FF running as long, but I did notice just before resetting this morning (after about 1.5 days), memory usage was a little high. (~1GB instead of ~700MB) I'll have to retry the test again.
Not sure if this is necessarily a problem caused by the patch but using it seems to be a huge contributing factor in FF's memory leaks (at least in my case). This has caused problems for me since for a long time and I'm only now trying to keep Grease Monkey disabled. So far, memory usage is pretty low (~600MB) even after a day or two. It used to go up to and beyond 2.5GB in that same amount of time. And this is considering I keep 2 pinned tabs of SE sites, refreshing every 15 minutes (5 for SO). This might be for the GM team or something but just thought you should know.
Yeah it's been broken since they've revamped the question pages. I haven't had the chance to update it. Thanks for pointing out the change, hopefully the fix will just be a matter of changing those variables.