This is exactly what ive wanted! Before i was running firefox with no cookies allowed and had to add domains manually to firefox exceptions list, and without wildcard support, it become a bit of a mess for sites with many subdomains. This plugin blacklists every site by default and allows export of cookie permissions, which is super awesome! Really love this plugin so far. :)

Feature request: Allow syncing of cookie permissions somehow so it works across all computers for the same account.