Plenty of add-ons seem to do what you want. Here's a few I found with a quick search: https://addons.mozilla.org/en-US/firefox/addon/profilist/ https://addons.

Plenty of add-ons seem to do what you want. Here's a few I found with a quick search: https://addons.mozilla.org/en-US/firefox/addon/profilist/ https://addons.mozilla.org/en-US/firefox/addon/profilist/ https://addons.mozilla.org/en-US/firefox/addon/profile-buttons/ https://addons.mozilla.org/en-US/firefox/addon/profile-butto... https://addons.mozilla.org/en-US/firefox/addon/profileswitcher/ https://addons.mozilla.org/en-US/firefox/addon/profileswitch...