Flag on the Play Rated 2 out of 5 stars
I can accept the worked required in establishing the white list, which, after all, is the record of my choices.
What I object to is the extra work having to install this extension twice before the flag icon appeared in the addon bar. (In the end, I had to put it there.) Since the flag is the straightforward interface allowing my preference settings, its absence (while blocking connections) was just plain weird. Of course, I can access the same settings via the context menu (which I'm not told on this page), but the easy access of flag is the selling point. I finally found it in the icon collection, waiting to be installed.
Good thing, because there were some things I wanted to unblock.
2 stars for functioning . 3 stars unearned for a poor installation.