At the moment I'm using context menus a lot to access commands in Firefox, but I would like to replace this repetitive clicking and searching with keyboard shortcuts for the common tasks that I perform.

How to assign keys to add-on functionality?

E.g. I use Close Other Tabs from Tab Mix Plus a lot - but I could not find any add-on that allows me to create a key combination for it e.g. Ctrl Alt Shift F4?

• My search did yield Key config, but this extension does not allow mapping to add-on functions
• I thought Menu Editor might be relevant, as you can change menus with it, and re-arrange even add-on items
• A rather demanding solution here, which seems to require re-compiling some jar files Customizing menu shortcuts in Firefox