Lots of crashes with mozalloc.dll

[blind12]

If memory testing does not complete and shuts down your system while testing, you definitely have an issue with hardware. Please get your computer checked out. Swapping out memory for different modules may avoid immediate problems depending on the speed/stability of the modules, but won't necessarily give you a stable overall system.
Of course it's unlikely if you are using multiple different physical computers (I'm not sure if this is the case? You mentioned it not being related to computer/OS) that they would all be affected, but if it's a single computer, then hardware is very likely the only cause. Overheating, bad motherboard, and similar can all cause these kinds of issues.

The replaced memory units test endlessly without errors with memtest86+ so there shouldn't be any hardware issues on this computer any more. It seems the stability is better but not great.
New profiles don't crash until I load tons of tabs, then they get unstable, too.

And it appears to a "common wisdom" that Firefox is unstable with tons of tabs? There are also tons of discussions on memory handling and allocation problems, I seem to recall that failure to allocate is not properly handled and causes a crash, the discussions were old though so things may have changed?

I have used multiple physical computers but I use only one now, the other ones had WIndows XP, this one has Win7 Ultimate 32bit. One common denominator that I remember is that all have had AVG at some point. Some addons and plugins are also the same, although versions are likely different. Foxit PDF viewer is the same, FF/Palemoon hunts down and loads its Quicktime plugins that are older versions, 7.6.6. I'll probably disable them. I have recently enabled click-to play anyway to escape the hideous autoplaying videos/audio on many webpages so I think they don't load?

Another common denominator between installations is also the ADHD "tons-of-tabs" thing

I noticed that Firefox/Palemoon by default hides plugins without associated extensions so I'll probably clean up that section as well.

I still wonder what loads kernelbase.dll.

Sessionstore.js occasionally seems to wake up and update after a long break.

[Moonchild]

Pale Moon has no real issue with a very large number of tabs; in fact it seems to handle it a lot better than the Mozilla builds. Sure, you will be using more memory, but otherwise it should be fine. I do suggest you use the "don't load tabs until selected" feature in that case, since you'll be using a needless amount of resources otherwise by loading all tabs even if you're not actively using them in that particular browsing session. Do keep in mind that tabs in principle are meant to be transitional elements - permanent storage of locations should be done with bookmarks.

Every tab added does add some CPU overhead as well, of course, if they are active. If your hardware is unstable for some reason, this may compound the problem.

As for kernelbase: did you try what I suggested: make a new, clean Windows user account and run Pale Moon in that to see if problems are alleviated? Because that is what Microsoft hints at as a solution for system run-time issues involving this library.

[Moonchild]

Doing some further research on both issues, I found a possible cause:
If you have the DirectX SDK installed it may be using a debug version of the DirectX libraries which may trip with this breakpoint error.
Since Pale Moon uses DirectX for its hardware acceleration, this could be the culprit?

Refs:
http://smartclientfactory.blogspot.se/2 ... nnect.html
http://joewirtley.blogspot.se/2008/05/h ... d-one.html