GUI issue i Firefox

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Turn off hardware acceleration :


With some graphics card and graphics driver setups, Firefox may crash or have trouble showing text or objects on pages when using hardware acceleration. You can try turning off hardware acceleration to see if it fixes the problem.

At the top of the Firefox window, click on the Firefox button and then select Options
Select the Advanced panel and the General tab.
Uncheck Use hardware acceleration when available.
At the top of the Firefox window, click on the Firefox button and then select Exit
Start Firefox the way you normally do.
 
If the problem is no longer happening, then hardware acceleration was likely the cause. You can try updating your graphic driver to see if that fixes it or simply run without hardware acceleration. Otherwise, your problem is likely related to extensions or themes.