I've read countless articles on how to fix this problem, however, the problem continues. I seem to have some sort of permanent Caret Browsing on this browser. I've gone into about:config and turned it true/false and the problem still remains. I have no idea how to fix this problem. Also, regardless of pressing ctrl + f7, nothing pops up, even when it's turned on to do so. It's incredibly annoying and I'd like help with fixing this issue immediately before my poor keyboard breaks due to my frustration.
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
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).
Do NOT click the Reset button on the Safe mode start window or otherwise make changes.