This is an extension that adds a button to gnome panel which when
clicked launches Firefox Profile Manager.
firefox -no-remote -profilemanager is the command that is actually executed.
[Note: This extension isn’t maintained any more.]
Installation Instructions:
Download:
cd ~/.local/share/gnome-shell/extensions
git clone https://github.com/xtranophilist/gnome-shell-extension-firefox-profiles.git
mv gnome-shell-extension-firefox-profiles/ firefox-profiles@xtranophilist
Restart Gnome: Alt+F2 to open run command prompt
Enter r
Enable Firefox Profiles Chooser Extension from Extensions from gnome-tweak-tool.
The extension is available in github repo.