Highlights is a cool add-on for Firefox to highlight webpages.

KwiClick is an essential Firefox add-on for everyone who searches the web! You can search the internet right from your status bar, without leaving the current page.

If your context menu in Firefox is long enough to trouble you and you want to slim and trim it, here is a nice add-on for you : Ffchrome.
FfChrome is an extension that slims and trims your context menus on the fly for simplicity, ease of use, easy access and eliminates the clutter. Menus show [...]