Disable Firefox Right Click Context Menu "Go Back" Button

Long story short, I make heavily use of the "Right click on a link-> Open in new page" feature. However, sometimes I misclick and the default item under cursor is "Go back". Which annoys me a lot. When I want to go back I often just do Ctrl + [ or use mouse button 4 and 5.

To disable this feature, do:

1. Go to about:config
2. Search for toolkit.legacyUserProfileCustomizations.stylesheets
3. Set to true

If on mac, we should also disable native context menu to make the change effective. In about config, disable widget.macos.native-context-menus

Then,

1. Go to about:support
2. Find Profile Folder
3. Click Open
4. Create a folder called chrome if not exist
5. In the folder, create a file called userChrome.css

In the CSS, write:

#context-back,
#context-forward,
#context-stop,
#context-bookmarkpage {
    display: none !important;
}


/* Email Image... */
#context-sendimage, 
/* Set Image as Desktop Background... (and preceding separator) */
#context-sep-setbackground, #context-setDesktopBackground,
/* Inspect Accessibility Properties */
#context-inspect-a11y
{
  display: none !important;
} 

Note that this also disabled other useless features, you can adjust to your taste.

Done! My new right click menu now looks like

Reference

What is userChrome.css? What can it do?

userChrome.org