From MozillaZine Knowledge Base

Most (if not all) of the knowledge base articles related to Firefox, Thunderbird and SeaMonkey refer to the menu sequences used in Windows. In the Linux and Mac versions of these applications, however, the menu sequences sometimes differ, as shown below.

Firefox and Thunderbird

Note: Starting in Firefox 4, the Menu bar is hidden by default on Windows Vista and above. To access Options (and other menu items), either click the Firefox Button at the top left corner of the browser window or press the "Alt" key to temporarily show a hidden Menu bar. Check View → Toolbars → Menu Bar to keep it visible at all times.

Application button

Recent versions have a summarizing menu to access frequently used items. This button is either in the upper-left corner of the title bar (Firefox 4.0 and later) or a [≡] button in the right corner of the main toolbar (Thunderbird 17.0 and later).

SeaMonkey

If you come across other menu differences, feel free to add them to the above.

See also

Mouse behavior in Linux

External links

• Menu bar is missing (Firefox Support)
• Preferences Mover extension moves preference or option related menus to the generic location.
• Menu Editor extension.
• Three pane mail UI specifications
• Ubuntu Unity Messaging Menu support