Recent version of FF need to press "Alt" to get the menu
Originally created by @tchou on #7493 (Redmine)
From UX session:
In https://tails.boum.org/download/index.fr.html we shoud mention the fact that on recent version of Firefox you need to click on “Alt” to get the menu (but maybe the addon is not working any more, I had contradictory feedbacks).