This just started happening this evening.
a little history: way back last year, or thereabouts, I posted about a weird problem I was having. over the course of 2 or 3 days I figured out how to fix it, but not what the cause was. the fix amounts to navigating to my user's .local/share/mime directory and removing the file named "globs".
So, back in the present: this evening that same problem recurred for the 3rd or 4th time since the original event mentioned above. so I deleted that file, logged off and back on (without the log off/on, the problem still occurs).
Having done that, I went to fire up firefox and KABOOM!! X dies and I land back at a login prompt. several times. every time. tried running firefox from a terminal but I don't see anything echoed to the terminal before it is blown away.
I still have the tarball from mozilla.org, so I moved aside the directory where the firefox runtime stuff is, re-extracted the tarball and it still croaks in the same way.
I'd appreciate some ideas to try, if anyone has any. Thanks in advance!
In the meantime, Opera works (though I can't install 12.0.2 for lack of a suitable version of rpmlib, so I'm not left browseerless.
Fred