Hi,
Please check if this happens in Safe Mode. Safe mode disables the installed Extensions, and themes (Appearance) in Tools (Alt + T) > Add-ons. Hardware acceleration is also temporarily disabled - the manual setting is Tools > Options > Advanced > General > Use hardware acceleration when available. All these settings/options/add-ons can also be individually or collectively disabled/enabled/changed in Firefox normal mode to check if an extension, theme, option or hardware acceleration is causing issues. Disabling/enabling hardware acceleration, and some types of add-ons in normal mode may require a Firefox restart.
Uninstalling Add-ons
Uninstalling Toolbars
Troubleshooting Extensions and Themes
Problematic Extensions
Options
If the problem persists please also check if this happens in a new profile. If the new profile is okay, you can then Reset Firefox on the old (previous) profile via Help (Alt + H) > Troubleshooting Information.
Hi,
Please check if this happens in [https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode]. Safe mode disables the installed '''Extensions''', and themes ('''Appearance''') in '''Tools''' ('''Alt''' + '''T''') > '''Add-ons'''. Hardware acceleration is also temporarily disabled - the manual setting is '''Tools''' > '''Options''' > '''Advanced''' > '''General''' > [https://support.mozilla.org/en-US/kb/Options%20window%20-%20Advanced%20panel?as=u '''Use hardware acceleration when available''']. All these settings/options/add-ons can also be individually or collectively disabled/enabled/changed in Firefox normal mode to check if an extension, theme, option or hardware acceleration is causing issues. Disabling/enabling hardware acceleration, and some types of add-ons in normal mode may require a Firefox restart.
[http://support.mozilla.com/en-US/kb/Uninstalling+add-ons Uninstalling Add-ons]
[http://kb.mozillazine.org/Uninstalling_toolbars Uninstalling Toolbars]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]
[http://kb.mozillazine.org/Problematic_extensions Problematic Extensions]
[https://support.mozilla.org/en-US/kb/Options%20window Options]
If the problem persists please also check if this happens in a [https://support.mozilla.org/en-US/kb/Managing-profiles new profile]. If the new profile is okay, you can then [https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems Reset Firefox] on the old (previous) profile via '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information'''.
