AgileTSOL said

Crash ID: bp-74918157-43de-43e5-b3d0-75ec32150326 Crash happens on some Active Directory users on different PC's, each have local admin rights. Firefox crashes on startup even in safe mode.

Additional Information:

I have tried this on the latest and earlier versions of Firefox and they all do the same. I have also ran Malware Scans and done clean installs.

The crash report shows;

Product Firefox Version 34.0.5

User Comments This is being run on a Domain Profile when it crashes but it works fine on alternativ

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP in front of the numbers, click it and select Submit.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.

Download Firefox Full Installer For All languages And Systems {web link}

It doesnt even get to a point where you can enter about:crashes.

I have also tried the newer versions and they do the same thing (Crash before it even opens).