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What you have to do is go through your extensions (mine are up to a few dozen now!) and decide if you *really* need & use that extension, especially if it adds a context menu. Some extensions are better than others and only insert a context menu if the type of right click you are doing is relevant. Others can stack multiple options into a single entry (like my favorite "launchy").
The benefit of disabling extensions is also a quicker startup for new Firefox windows.