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FireFox 4

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Is it worthwhile upgrading from FX 3.6.17 to FX 4?

If I upgrade what will happen to everything I have got stored on 3.6? You know like all my bookmarks, persona's, plug-in's, add-ons. history and passwords?

If I did change and I don't like it can I go back to FX 3.6.17

I tried the Beta and didn't like it and went straight back to 3.6.17

Is it worthwhile upgrading from FX 3.6.17 to FX 4? If I upgrade what will happen to everything I have got stored on 3.6? You know like all my bookmarks, persona's, plug-in's, add-ons. history and passwords? If I did change and I don't like it can I go back to FX 3.6.17 I tried the Beta and didn't like it and went straight back to 3.6.17

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Upgrading is very easy. Simply click Help | Check For Updates.

All your bookmarks, customizations are retained in a different location and remain unaffected by an upgrade; with the exception of some add-ons which may become incompatible with the new version. But you'll get a warning about those if that is indeed the case.

If you don't like it, then yes, you can go back to 3.6.17.