Well, at least my Firefox fixed. Itself. FF forever.

Explain to me in detail what happens.

Welp, I haven't had to disable anything and everything works fine.

I may have missed the details, and it may be stupid, but... Your account has normal rights and thus you can't install everything you want? So you should give the account admin rights.[/failadvice]

I'd post my real advice here, but you all already know what it is. So I'll just keep my virtual mouth shut (except for this)