These extensions I use for firefox 1.5.0.1 and I consider them essential.
- Google toolbar for Firefox – toolbar to search google, highlight words, etc
- BugMeNot – right click annoying sites that require login (NYTimes.com, etc) and it fills in a valid username/password
- del.icio.us – extension adding support for del.icio.us bookmarks/tags
- Fasterfox – speed up web browsing
- Tab Mix Plus – adds a lot of features to tabs, like the X on each tab, forcing new windows to be new tabs, session restoration (firefox crashes, reopens all tabs), options to reopen all tabs after closing firefox, other session and tab options
- Adblock Plus – blocks image / banner ads
- Adblock Filterset.g – updates adblock plus rules
- PDF Download – prompts to download pdfs rather than open in firefox (usually slow)
- Colorful tabs – colorizes your tabs
- Dictionary tooltip – doubleclick a word and get a ‘tooltip’ popup (not new window) showing definition
- Flashblock – stop auto-playing flash, enables you to hit play (great for sites playing sound, video, etc)
- Map this – highlight an address, right-click and it will take you to the maps.google.com for the address
- Greasemonkey: (custom scripts for websites!)
- Fark Lite (removes all left/right bars from fark)
- Google Image Relinker (takes you directly to image in images.google.com search results
- Google about.com remover (hides about.com results)
- CNN Friendly video
- Netflix links in IMDB (link to netflix from imdb)
- IMDB links in Netflix (link to imdb movie detail)
- Netflix Queue Manager (add to top or bottom of queue)
- MRQE Links in netflix (shows link to the movie detials)
- Experts exchange ad remover (removes annoying middle of page ad)
- Sourceforge.net direct download (no mirror hopping)