I don't need most of the items on the context menu and I guess most users don't need them. They bother me, because sometimes I click by accident on them:

* Save as bookmark (with FF 3.0 you have this nice star in the url bar and under "bookmarks" you can also save them)
* Send Link
* Copy Image URL
* Send Image
* Use as background image (you can easily do this in gnome)
* back / forward (you have icons)
* reload (F5 + icon)
* stopp (ESC + icon)


To check weather most other users behave the same way I made a proposal for a mozilla test pilot test: http://labs.mozilla.com/testpilot/