Doesnt add a button really, adds a tab with a button on that page. Needs to be a button on the tool bar to be functional

Не работает. Удалите уже это отседа. Перезапуск браузера — фиктивный.

had to uninstall, because any benefit this plugin has is negated by constantly spamming the authors site on EVERY little update!

This doesn't restart the browser itself, but closes all tabs and opens them again

Everytime Firefox updates, this add-on loads some ridiculous page and also gives you a toast message near the taskbar asking for donations. Uninstall.

Не работает. Не только не перезапускает браузер, но еще и уничтожает сессию, сбрасывает открытые окна и вкладки. FF94

Its function was fine but it would open a new window with this its download page open, as a hint that I should make a contribution presumably, on start up and as a result my previous session would not open, requiring that I open my previous session from History, Recently Closed Windows. So I removed it.

Damned CRAP!! RARELY Works.

This addon doesn't work properly - the tabs opened after restart are (very) different.
Also - and this is really bad - here is the list of permissions used. How can this be justified.

Access your data for all websites
Exchange messages with programs other than Firefox
Display notifications to you
Access browser tabs
Access browser activity during navigation

I don't know who Nacho Vázquez is, but judging by that list I don't trust him.
I'm about to uninstall, but I will repeat the tip given by mjjordan :
If you want a TRUE Firefox restart IN TWO CLICKS, do this:
1) Type about:restartrequired in your browser
2) Drag and drop that page to your toolbar
3) Click "Restart"

This addon does not restart the browser.

ce module ne fonctionne pas toujours, il doit alors être désinstallé puis réinstallé pour fonctionner correctement

The author of this crappy extension is either a jerk or a con artist, as it doen't work at all, but make you go through a bunch of weird headaches. I wish I could give it 0 star. Stay away, it does not restart, and it's the worst extension ever in FF!!!

This does not "Restart" browser it merely "Refreshes" browser. There is a big difference.

再起動しません。
Do not restart

Stop looking for the Holy Grail of a usable restart button - they don't want you to have it !
BUT USE THIS INSTEAD : If you want a TRUE Firefox restart IN TWO CLICKS, do this:
1) Type about:restartrequired in your browser
2) Drag and drop that page to your toolbar
3) Click "Restart"
Done!
All credit to Andorio2007 - brilliant ! It works - no messing !