How to remove navigation controls from Firefox right click menu?

Solution 1:

AFAIK, there is no built-in method of doing it. However you can use one of the addons. Try using Menu Editor. The name of the tool is pretty self explanatory. Does what it says - allows you to edit context menu.

enter image description here

Solution 2:

You can also use the Classic Theme Restorer add-on to replace the context menu icons with labels:

context menu text

Solution 3:

Add to Stylish:

#context-navigation,
#context-sep-navigation {
  display:none !important;
}

source: http://forums.mozillazine.org/viewtopic.php?f=7&t=2865005