This looks amazing! I have been using Self-Destructing Cookies[1] for few years and while I think the extension is great, I always feel there's not enough isolation between tabs. For example, if I have Twitter logged in in one tab, and other tab contain Twitter button, then the other tab can still have access to my Twitter cookie. (Because Twitter tab is still active, so SDC would not destroy the cookie.) I know this…
You may want to try uMatrix[1]. It block any 3rd party content by default (cookies, scripts,...) . So Twitter buttons (and similar) do not load by default, but you can allow it with two clicks. [1]: https://addons.mozilla.org/en-US/firefox/addon/umatrix/
SDC + uMatrix do make a really great combination, and I'm really glad I use these extensions when I see some sites loading 10+ trackers that are not relevant to site's function at all.