When I re-open Firefox every day, it brings up old tabs from tabbed browsing, even though I keep closing them. It's not App Tabs, but just regular tabs from tabbed browsing. How do I keep them shut down?

Question

Each time I open Firefox, I get about 8 old tabs that open in the tabbed browsing bar. I don't want them -- they are not pinned apps and they're just old tabs I tried to close. How do I stop Firefox from remembering them?

Answer 1

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.
There is software like Advanced SystemCare with its Surfing Protection feature that can protect files in the Firefox profile folder against changes.
If you have such software then check the settings or uninstall this software.
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.
*http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/