Firefox has many virtues, but none match its ability to adapt to the needs of its users. While it does not especially evolve, it can be continuously improved through the addition of extensions.

This list is a compilation of several lists I have written in the past, and is not meant to serve the needs of all users. However, I find that these extensions are almost universally enriching.

1. Adblock – Blocks ads individually or by using wildcards.
   
   
2. Adblock Fileset.G Updater – Updates the list of ads from a central list.
   
   
3. All Your Maps Are Belong To Us – Transform other map site urls to Google Maps
   
   
4. Bug Me Not – Bypass registration with community logins
   
   
5. ErrorZilla – Provides a more useful error page
   
   
6. Greasemonkey – Handles users scripts for minor and major tweaks
   
   
7. IE Tab – Change rendering engine from Mozilla to IE
   
   
8. Linkification – Turns pure text links into clickable links
   
   
9. Map This – Adds a context menu button that wills Google Map a selected address.
   
   
10. Nuke Anything Enhanced – Removes just about anything from a webpage
    
    
11. PDF Download – More options provided when opening up a PDF (including cancel)
    
    
12. Quick Proxy – Turn on and off a proxy with a single click
    
    
13. Screen Grab – Capture an entire webpage (multiple screens worth) as an image
    
    
14. Searchbar Autosizer – Resize the searchbar as you type
    
    
15. Search Engine Ordering – Re-order the search engines in your search bar.
    
    
16. SourceForge Direct Download – Skips the selection screen for a download site and selects your favorite
    
    
17. Tab Mix Plus – Provides lots of tab customization options
    
    
18. URL Fixer – Fixes 1D-10-T spelling errors when typing urls (.con -> .com).
    
    
19. Video Downloader – Download videos from various websites.
    
    
20. Web Developer Toolbar – Provides more than a little information about a particular website, this is especially useful for debugging.