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About this Add-on
When it enables cookies, it intentionally still disallows all third party cookies unless you right-click the icon to toggle the thirdparty.sessionOnly preference (the cookie icon puts on a party hat and the status shows in a tooltip when hovering over the icon). Then it'll only allow third party cookies from sites you've already visited and won't retain them upon the next restart of Firefox.
This is primarily for people who like to keep cookies disabled unless it breaks a site, never want permanent third party cookies, and probably have the "Ask me every time" option selected to control exceptions like a whitelist (tip: that option is more bearable when you set the about:config pref network.cookie.alwaysAcceptSessionCookies to true for less repetitive prompting)
Bonus: Middle-click the icon to open your cookies list in a new tab.
Extra Bonus: Hold down Shift or Ctrl when middle-clicking the icon to open about:config?filter=network.cookie in a new tab for anyone curious to view pref changes live as you click/right-click the icon.
To avoid scope creep in future versions, here's an existing feature tip (built-in to the browser) for anyone that would ask for this extension to access per-site cookie settings, on any page:
- right-click -> View Page Info
- click on Permissions tab
- view or change the Set Cookies options directly
Note that due to bug 773297 if you move the icon in the UI through Customize, right-click and middle-click will stop working until you left-click the icon.