You can use your userchrome.css to apply a background-color selectively to individual context-menu options. I do it for "view background image" and "copy link l

You can use your userchrome.css to apply a background-color selectively to individual context-menu options. I do it for "view background image" and "copy link location," both of which I turn a deep purple. I've found this makes misclicks on these options (which are pretty much the only two I ever use) next to zero.