Most Useful Firefox Addon

1. DownloadHelper: It helps in downloading videos from site's like youtube, google videos, yahoo videos etc.
   
   
   Click here to Download DownloadHelper(convert extension from zip to xpi)
   
   
   
2. Xmarks: It Help in maintaining your bookmarks(i.e store your bookmarks in your account at xmarks site by synchronizing your bookmarks to your database.
   
   
   Click here to Download Xmarks(convert extention from zip to xpi)
   
   
   
3. Firebug: Very usefull tool for editing web document(html file) in browser itself(and can see change on click).
   
   
   Click here to Download Firebug(convert extension from zip to xpi)
   
   
   
4. Greasemonkey: Very usefull scripting tool used to insert some script which will execute everytime you visit that webpage (for example price comparison in amazon.com).
   
   
   Click here to Download Greasemonkey(convert extension from zip to xpi)
   
   
   
   
5. FlashBlock: Every time you start any site containing a lot of flash constant(most flash file contain ads) it start downloading all the content without asking you and consume a lot of bandwidth(speed) so to instruct which flash to work(start download) you can use FlashBlock.
   
   
   Click here to Download FlashBlock(convert extension from zip to xpi)
   
   
   
6. Url Fixer: It is for those people wo made mistake many a time when typing the name of site into url(for example if u type google.con then this plugin will correct it).
   
   
   Click here to download Url Fixer(convert extension from zip to xpi)
   
   
   
7. Fireftp: This tool is very useful for web site owner because it helps them upload the file very easily onto there site.
   
   
   Click here to Download Fireftp(convert extension from zip to xpi)
   
   
   
   
   
   
   
   
   
8. Adblock plus: Very handy tool for improving the bandwidth use because it block all the ads (for example images ads).
   
   
   Click here to Download Adblock plus(convert extension from zip to xpi)
   
   
   
9. SearchStatus: An Seo tool for web developer to see the alexa, pagerank, compete and moxRank Ranks and many more
   
   
   Click here to Download SearchStatus(convert extension from zip to xpi)
   
   
   
10. Kallout: It helps you To search on the web just by selecting text and give many option as well(for example if an article is present on the text on wiki it gives you the option).
    
    
    Click here to Download kallout(convert extension from zip to xpi)
    
    
    
11. Download Status bar: This addon will integrate your download window in the statusbar of your firefox(this way we can get rid of interrupt of download window of firefox)
    
    
    Click here to Download Download Status bar(convert extension from zip to xpi)
    
    
    
12. Answers: Always run for answers.com for problem now it is very easy to get help just alt+click the text to find the answer.
    
    
    Click here to Download Answers(convert extension from zip to xpi)
    
    
    
13. Fission: Fission combines address bar and progress bar. This makes the progress bar more visible and has a nice visual effect.
    
    
    Click here to Download Fission(convert extension from zip to xpi)
    
    
    
14. Temper data:It is very usefull tool for computer geeks because this can be used to manupulate the outgoing form data such as some hidden value or some no.
    
    
    Click here to Download Temper data(convert extension from zip to xpi)