The four linked crash reports are very diverse, and I don't see a unifying thread. A couple of them do seem graphics related, so I'll suggest a pretty basic troubleshooting step, which is to disable Firefox from using hardware acceleration. This is a typical workaround for incompatibility with your graphics card/chipset driver software.

"3-bar" menu button (or Tools menu) > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

This takes effect the next time you exit Firefox and start it up again. Any difference?

Found the issue! Bad stick of memory. Thanks for the feedback!