Presumably this is the Centos distro version of Firefox. And you will be on Fx17 as the ESR version. I normally use and run a Ubuntu distro (Canonical)Firefox26a Crash reports from distro versions are usually handled by your OS's on crash reporter. Help with your OS should be sought elsewhere, however I imagine Centos keeps logs, presumably within /var/log and they will be easily viewable ether as text files or with some graphical viewer. Looking at your logs should help you discover the reason for any hang or problem and whether or not you have had a crash. Maybe reading these articles helps * [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] <br/ > You could look for about:crashes but I think you will find it does not exist on your distro version. *[[Avoid crashes - Tips and tricks]] *[[Firefox hangs or is not responding - How to fix]] Consider trying Firefox reset, but close unnecessary open tabs and bookmark any sites left open and the home pages of any Firefox extensions you have installed. See the cautionary note in the following article. * [[Reset Firefox – easily fix most problems]] One work around if nothing else works would be to install the Mozilla Firefox 25 Release as an additional browser. We should be in a much better position to help you with that. <br />(Are you in a corporate environment ? with an IT department? ) * [[Install Firefox on Linux]] This installs totally separate from your distro install of Firefox.