Samsung devices have a hardware menu button. It is on the same row as the home button and the back button on the bottom of the screen.

The hardware button should work, but you should not expect to see a menu similar to the desktop Firefox menu. I have attached screen shots (one version old) of the items you can expect to see. Yours might be split into two parts along the bottom instead of dropping from the top.

I've been using Firefox Mobil from when I got the Xoom FE. I know the mobil menu but it didn't pop open on the native menu button.

Weird thing - tonight it is working. Could it be that I updated the pc to 29.0 and logged into sync on it???? Maybe mobil was trying to log in an got stuck because there was nothing to sync to????

The Firefox menu is indeed intermittent on this device. It is NOT user error or inexperience.

- If you cold-start Firefox, the menu works (accessed via the tablets menu softkey). - Menu may work for a few instances, then fails to open at all, even with repeated pressing of the menu softkey. - Menu only stops working if you actually go into Menu -> Settings. Selecting "New Tab", "new Private Tab", or any of the "Tools" menu options can be done repeatedly and does not break the menu. - Menu softkey is working & responsive (lights upon touch, works in other applications). - Forcing Firefox closed, then restarting it restores the menu operation temporarily (same issue reoccurs).

Galaxy Note 10.1 2014 tablet Android 4.3 Firefox 29.0.1