Can you share the website and what you were selecting when it "doesn't do anything"?

I've been using this since September when I created it and it almost never failed... with a particular case in reddit.com that was fixed immediately.

Sometimes it does not work, but I only get this every once in a very while and could not debug it.

Thanks for the feedback, I'm looking forward to correct what is failing!

ps. works in my environment Firefox 59 (nightly) as of December 14, 2017

pps. I've added an image in the addon page to better show how it is supposed to work as I believe some users installed it with mismatched expectations (name could be ambiguous)