right mouse click (little menu bar) than click option 4

[Arclite86]

i want to click an addon in firefox and i can only activate it when I right click on the mouse and 

click the 4e option in the little menu bar the name of the addon is "check all on tweepi U" i have tried to find a shortkey but firefox doesn't allow shortkeys for addons as far as i know

so i want to create this function

but i dont want the mouse to be moving

because i need to do this action allot of times and i dont want my mouse to be moving like crazy for a few seconds

please help me

[Danp2]

The letter "U" is defined as an access key for that menu item, so theoretically you could access it by right clicking within the browser window and then sending the keystroke U.