Miles, Welcome to the forum and thanks for posting your question!

Firefox 3 has many benefits over version 2. It's faster, uses less memory, better password management (still not as good as Roboform!), updated download manager , etc. The coolest new feature is the address bar (in my opinion). When you begin typing in the address bar it looks your bookmarks and history. If you've visited a site or stored a bookmark it brings up those matching sites as you type. It also "learns", so sites you visit more often appear first. It's very useful.

Some of the addins may be a problem because the underlying framework is a little different, but I don't think that is a big problem. Open up your addin manager and write down the extensions you have that you really use. Go to [url:8syrh26h]https://addons.mozilla.org/en-US/firefox/[/url:8syrh26h] and see if they are compatible with version 3.

To be honest, every extension I use except one was updated. FF3 will install over FF2 and automatically check the compatibility of the addins already installed. If they aren't compatible it will disable them and notify you. This is the path I would follow. FF2 won't be supported much longer, so go ahead and update. It's a better browser and you won't be sorry.