

*Switch to the DEFAULT theme: "3-bar" menu button/Tools > Add-ons > Appearance

Start Firefox in ] to check if one of the extensions ("3-bar" menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem. *Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies" *Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now" *Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux) *Hold down the Shift key and left-click the Reload button If you revisit a 'forgotten' website then data from that website will be saved once again. You can't recover from this 'forget' unless you have a backup of involved files. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note. Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History").
