Organize menu in firefox

Hello.
I wondered if it was possible to rearrange the context menu (right click) at will?
I mean we want to choose what to put in and change the order in it.
It is possible? With an extension or something else?
Thank you in advance.

This extension may be Menu Editor Customize application menus:

Rearrange or remove menuitems from the main context menu (right-click menu) and main menubar (File Edit View etc.)

Download it from here https://addons.mozilla.org/en-US/firefox/addon/710

In fact, contrary to what its name suggests, MenuEditor does not edit the menus, only to rearrange (reorder, hide elements). This is already quite
The only thing we can add it separators!