Since I use several Firefox profiles, it has been necessary for me to somehow identify the profile any given Firefox window belongs to. This extension allows you to customize the title bar. There are several variables available. Unfortunately, the Firefox profile name isn't one of them anymore, so you need to hard-code it in the extension's options tab. Apparently, the profile name *was* a variable several years ago, but a change to WebExtensions apparently made it unusable.

Useless. Does not integrate into the tools menu and therefore you have no access to anything within this add-on.

Nice!

If you want to copy something that you wouldn't normally want to, this is the extension for you.
WebExtensionAPI has pretty much sent everything else down the loo.

Is there no way to show the profile name in the titlebar???

I used this one for "force addon compatibility". Missing greatly.