I updated a test system and with this update I lost my FF settings.

In FF 25 I change my preferred settings in Options, but the changes do not stick when I exit/restart FF.
This only happens when I run FF from my Standard User account that i use for everyday use.
If I run FF with "Run as administrator", I can make changes, and the changes stick.

I created a new FF profile, and I can make and keep changes that stick when running as a Standard User using the new FF profile.

I've been using FF for years and don't remember seeing this problem before with a FF update.
I've only tried FF 25 on one system, so I'll have to update another system to see if I have the same issue...

I updated to FF25 yesterday, they've also released quite a security updates with this release.

It's the same for me, maybe a little smoother but not much difference.

I tried FF 25 on another system and don't have the problem i posted in post #2.

In case anyone else runs into the issue I found on one system, here's a bit more detail.

I have a problem with this:
Win 7 64 Bit, Avast 9 AV, and Pale Moon as the default browser

I don't have a problem with this:
Win 7 32 Bit, MSE AV, and FF as the default browser (Pale Moon not installed)

I think it's something obscure/unique to my system where I do have a problem...perhaps Palemoon, maybe Avast 9 ... could be anything ...

I'm ok with creating a new FF profile to fix the issue if/when I run into it.