BB Code Helper 0.2
by Wildcard
Download (Mozilla) – Contribute (GitHub)
Adds a context sub-menu to Firefox allowing tagging of selected text (quote or code), links, and images which are then copied to the clipboard as BB Code.
There are a couple of other options as you can see from the screen shot, but mainly this is a replacement for Forum Tags Plus that is now incompatible for Firefox Quantum.
See the README for more details.