I am migrating from Windows XP to Linux Mint on a separate computer which came with Firefox pre-installed. The latter appeared to work well until the lack of a Bookmark tab alerted me to the fact that I had no Menu bar. I have tried all the solutions I can find but to no avail. Right-clicking the Tab bar, for example, yields only 'Hide Toolbars' and 'Exit Full Screen Mode' as the drop-down options whilst right-clicking anywhere else on the screen also fails to reveal the Taskbar Hide/Show options. Without the Menu bar I obviously have no Customize option and for similar reasons have been forced to use an alternative Windows XP computer to send this report. Clearly, no additional information relating to the operation of Firefox on this computer will be of use in troubleshooting the situation on my Linux machine.