This question asks how to delete all Firefox cookies and cache, but I need to delete cookies from a specific site. How do I do it?
Go to Preferences -> Privacy & Security -> Cookies and Site Data then click on the Manage Data button then search for the site. Click on the site(s) to select and click on Remove Selected, then Save Changes.
That's all you need to do.
You can use
sqlite3 to delete cookies from terminal (Install if necessary:
sudo apt install sqlite3)
sqlite3 ~/.mozilla/firefox/*.default/cookies.sqlite \ 'delete from moz_cookies where baseDomain="example.com";'
sqlite3 ~/.mozilla/firefox/*.default/cookies.sqlite \ 'delete from moz_cookies where baseDomain LIKE "%google.%";'
To delete history for a specific site:
sqlite3 ~/.mozilla/firefox/*.default/places.sqlite \ ' delete from moz_historyvisits where place_id in (select h.place_id from moz_historyvisits h join moz_places p on h.place_id = p.id where p.url like "%example.com/%"); delete from moz_places where url like "%example.com/%"; '
There are some more interesting tables and you might need to delete from e.g.
moz_bookmarks_deleted to remove more trails from a domain.
Note: Firefox must be closed, or you will see an error message:
Error: database is locked
To save energy and time, you could install an add-on for this. Then you dont need to clear the cache of cookies manually any more. In FF browser go to menu in right corner above. Select "add-ons" and type as search word there above "cookie blocker" - so you have the free choice for data-protection of your privacy. There you can install for example "Ghostery" as add-on, then adjust it to your needs.
Press Ctrl+Shift+Delete you will get the Clear browsing data select cookies and other site data click on Clear data
Here's a quick and handy method I use often:
Bookmarklet source: https://www.squarefree.com/bookmarklets/zap.html