after deleting all cookies, verify deletion, restart, then cookies are back
i delete all cookies. verify that there are no cookies left in firefox. shutdown, restart. it appears all the cookies have reappeared. how to really delete all cookies?
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Note that some extension create special opt-out cookies that you can't remove as long as the extension is installed.
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
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
If clearing cookies didn't help then it is possible that the cookies.sqlite file that stores the cookies got corrupted.
- Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookies files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.
You can use this button to go to the currently used Firefox profile folder:
- Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
- http://kb.mozillazine.org/Profile_folder_-_Firefox
Type about:preferences#privacy<enter> in the address bar.
Next to History, choose Use Custom Settings
Near the bottom, turn on Clear History When Firefox Closes Then to its far right, press the Settings button.