Firefox 3.0 is the best web browser we've ever seen.
Care with extensions
If you can't live without a particular browser extension, you'll want to hesitate before immediately upgrading to Firefox 3.0. Firefox's new extension subsystem insists that any extension provide a secure website for updates; it also changed some of the APIs. Extensions that don't currently support these changes (as of this writing, this included Google Toolbar ) won't work with Firefox 3.0.
On the other hand, you may find that you don't need many extensions commonly used with Firefox 2.0. For example, with the new Firefox 3.0 you can increase text size, so you may no longer need extensions such as NoSquint.
Firefox also finally has an improved download manager, which supports interrupted download resumption, so you may not need a third-party download manager. In addition, Firefox 3.0 can now register web-based protocol handlers. This means that you can now open mailto and iCal links with your web application of choice without adding an extension.
In other words, if you don't absolutely need incompatible extensions, there's a lot to be said for upgrading to Firefox 3.0 today.
Firefox has also improved its help system. It now reaches out to the Firefox support website for help information. Everyone has the experience of searching for help, only to find that the on-PC help is hopelessly outdated. With Firefox 3.0, you can always get to the most current information.
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