I've installed so many add=ons on firefox 3, but when I changed to firefox-4 these add-ons are not compatable.
The addons I've installed were crawler tool bar, zone alarm tool bar, you tube downloader etc....
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There are many video downloaders that work with Firefox 4, such as Flash Video Downloader (Youtube Downloader) and Easy YouTube Video Downloader.
For other add-ons you need to check with the developer to see if they have released any updates to their add-ons. For those that have no been updated you can check the Mozilla add-ons site to see if there is an alternative.
For the compatibility of many common add-ons see https://addons.mozilla.org/en-US/firefox/compatibility/report - those listed as either 4.0.* or 4.2a1pre will work in Firefox 4