But things change as you add new Firefox extensions.
For instance, I have six Firefox extensions (FireBug, DownloadThemAll, JSView, ScrapBook, Yoono, FlashGot) and they have all added several new items to the right-click menu.
The contextual Firefox menu wore a cluttered and extremely confusing look until I installed Menu Editor - a must have Firefox extension.
As the name suggests, Menu Editor lets you rearrange (move) existing menu-items, group similar commands or remove items that you rarely use (e.g., View Page Source is useless for non-techies and they can safely hide it).
You can also use the Menu Editor extension to re-arrange and trim your Firefox Menu bar on the top (that has the File, Edit, Help commands)
The extension definitely makes you feel more productive because, with the junk removed, you'll find the frequently used menu items much much faster. [See the Firefox contextual menu after the Menu Editor treatment - much better]
Menu Editor [Access it from the Firefox Add-ons Dialog]