How to open firefox "open menu" using keyboard shortcut? I am unable to find the keyboard shortcut on google. I want to automate the process using selenium as I want to open an installed add on.

How to open firefox "open menu" using keyboard shortcut? I am unable to find the keyboard shortcut on google. I want to automate the process using selenium as I want to open an installed add on.

For an automation task like this you maybe using the wrong technology.
Have you tried using AutoIt for a task like this? Then switching back to Selenium when you need to interact with the DOM?
You can reach some of the main menu's options via the hidden extended menu set which can be shown after pressing Alt when not in fullscreen mode.