Review for Hide Menubar by lobster
Rated 5 out of 5 stars
"This addon has become obselete" is not true!It still has its purpose on linux machines. Sure one could press F10 but giving up habits is hard, also the Firefox dropdown-button on the right side (shouldn't it be on the left side?) is not set to be visible with this addon.
To create your own collections, you must have a Mozilla Add-ons account.