*Hold down the Shift key and left-click the Reload button Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance). 'Remove Cookies' from sites causing problems: You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
You can try these steps in case of issues with web pages: