http://google.com Block
https://google.com Block

http://google.ca Block
https://google.ca Block

http://youtube.com Block

http://youtube.ca Block

... Also, why do I need to put each website in twice? (for http and https) I can't really think of a scenario where I'd want to block one and permit the other.

You don't need to enter the insecure addresses for those sites since they are not used, but you do need the secure addresses. Those are missing for Youtube.

Some time back, Firefox switched how permissions are handled internally from bare host names (www.example.com) to origins/principals (protocol://www.example.com). I don't remember the reasons, but that is how it is.

So you only need these:

https://google.com Block
https://google.ca Block
https://youtube.com Block
https://youtube.ca Block

The missing https://youtube.com Block is a typo in my original message. I have that entry present, but every time I go to the youtube.com website, I see a youtube.com cookie present.

Hi jeff77, when you are on YouTube, can you open the Storage Inspector tool in the lower part of the tab by pressing Shift+F9. Firefox should show all the cookies set in the current page. You can use the right-click context menu to remove them. Then reload the page (Ctrl+r, or Ctrl+Shift+r to bypass the cache) and see which ones come back. Are they set on a slightly different host name by any chance?

Thanks, that's helpful. At least I can now see what data is being stored.

The domain used is slightly different - the cookie is under https://www.youtube.com, but the domain is listed as .youtube.com (yes, the dot in front is present) However, when I add both of those to the permissions list, the youtube cookies are still showing up every time I reload the page.

Hmm, that's very strange. I wonder whether the cookie might be coming from a different context, i.e., not directly from the page. Do you have any add-ons that might be contacting YouTube in the background when you visit the site?

Hmm, that's very strange. I wonder whether the cookie might be coming from a different context, i.e., not directly from the page. Do you have any add-ons that might be contacting YouTube in the background when you visit the site?

I do, yes. I have an Ad blocker and a script blocker. However, to see if those might be involved I disabled both, restarted Firefox and retried it. I saw the same behaviour.

If clearing cookies didn't help then it is possible that the cookies.sqlite file in the Firefox profile folder that stores the cookies got corrupted.

• rename/remove cookies.sqlite (cookies.sqlite.old) and when present delete cookies.sqlite-shm and cookies.sqlite-wal in the Firefox profile folder with Firefox closed in case cookies.sqlite got corrupted.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

You can also check the storage/default folder for a youtube folder.

Removing the cookies.sqlite file didn't help. However, creating an entirely new profile did.