This script removes all cookies from Firefox browser cache that are not coming from the given whitelist.
To use, create a file called preserved_host_suffixes.txt with the
list of hosts you want preserved, one per line. Like this:
your_chat_website.com
work_email_site.com
Then shut down Firefox and run the script:
./prune_cookies.py
After this every cookie whose hostname does not end with an entry in
the file is deleted. This means that, for example, cookies from
foo.your_chat_server.com are preserved, but those from foobar.com
are deleted.