Rated 4 out of 5 stars
Beware of a bug in 2.15 !
Cycling through proxies is broken in 2.15.
Until 2.15, cycling through proxies in status bar worked like a charm. Re-applying the settings, restarting the browser didn't help. Thankfully, reverting to 2.14 fixed it for me.
Sorry for the problem. This is now fixed in 2.16.