Did SteamGifts Plus stop working for anyone else?

I had the same problem few weeks back. I switched to the version for Tampermonkey, which is itself an extension for Chrome. :D
No problems so far.

mine works just fine on chrome

Seems fine to me on Firefox.

Ya, Chrome now will remove extensions that aren't listed on the Chrome Web Store. I had to install Tampermonkey to get it to work too. In theory, a solution would be for someone to list it on the Chrome Web Store.

Yeah, what semifamous said. Here's and article with some more info: -->clicky<--