Firefox addon vs MyLibrary

I checked the Help Forum but couldn't come up with any help on the following questions:

1. I downloaded the Firefox addon but couldn't get the hang of it, so I removed it. I then went to zotero.org and set up an account and started working with MyLibrary (which I like). So, where is the MyLibrary database on zotero.org and how can I back it up and/or export it?

2. Should I reinstall the Firefox addon? If I do, can I use the online system too, or just the Firefox addon? Do they get synched?

Thanks for any help you can give.

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