what are the necessary and useful add-on in firefox?

Flashblock - blocks all java and flash applications on websites untill u click on them. This stops unnecessary bandwidth usage and gives you more control over all those annoying ads that always pop up.

DownloadThenAll - is a download program integrated into Firefox that supports resume support. It also increases the speed of your downloads

DownloadHelper - useful for getting those videos on sites like Youtube. It will give you a direct link to the exact file being played on your pc.

Not sure if these all work for FF 3 cause atm im using Vista and FF 2 as I find it more stable. These addons along with the extra search engines I've added to the box in the top right of Firefox makes browsing just that much easier

it incredibly is relies upon on your desires. in case you pick some advantageous factors that firefox itself would not have yet an extension has. then you definately can setting up this extension. as an occasion, i do no longer in hassle-free terms like the classified ads in internet pages, so I setting up advert block plus in my firefox and Avant browser.

Go to this URL, they have many good articles on FireFox extensions and add-ons.

http://mashable.com/category/firefox/?active=popular

ShowIP
and obviously
GreaseMonkey

IETab:

http://ietab.mozdev.org/

Is good for sites that have been specifically designed to only work with IE.

Stumbleupon toolbar is most useful addon i use

but here's more:
http://www.bestcollegesonline.com/blog/2008/07/17/50-firefox-3-add-ons-that-will-change-the-way-you-surf-the-web/

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http://www.readwriteweb.com/archives/top_10_firefox_addons.php