Rated 5 out of 5 stars

per Tsar Lazarovitch el jul. 1, 2022 · enllaç permanent

Works on v.102.0. Very tiny, simple and unobtrusive. Almost couldn't see where the icon was but now I know where to look for it... Don't need the extra colours, but if anyone does, they're there.

I imagine that's due to the way Tbird security is now but it's not an easy process to install addons like it used to be. At least the process can be found in the help.