Firefox for Windows 8(7 posts)
The first thing to do in cases like yours is to try running Firefox in safe mode.
NOT Windows safe mode -- but Firefox's own safe mode.
This will temporarily disable all your add-ons, which can often be a cause of conflicts such as yours.
If you do not experience your problem while in safe mode, then you will need to figure out which add-on may be the culprit.
Have a look at the link below, which is Mozilla's basic troubleshooting guide to Firefox and will help walk you through a step-by-step procedure.
"Troubleshoot Firefox issues using Safe Mode"
Hope this helps.
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