Hi meconium, try '''disabling graphics hardware acceleration'''. You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.). Go from: #Open Firefox ''Options'' window : #click the menu button [[Image:New Fx Menu]] and select ''Options'' #In the Firefox Options window, click the ''Advanced'' tab, then select ''General''. #In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. '''Uncheck''' this checkbox. #Now, restart Firefox and see if the problems persist. Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles: * [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] * [[Upgrade your graphics drivers to use hardware acceleration and WebGL]] Thank you.