I have installed firefox Aurora, but can I uninstall it and go back to Firefox 11 if I find version 11 better? Will I lose history and bookmarks?

I have installed the new version 13, called Aurora. I am currently using it, but if I start not liking the new features (so far I do! But I have to ask) can I "go back" to the "good old" Firefox 11?
Will I be loosing my data and settings? History and bookmarks?
My computer is a Pentium M 1,6GHz (2004.) and the version 11 seemed very stable. The reason I installed Aurora is because I wanted to try your new software.

Also, before you go back to an older version (transition from Aurora to Release), you might want to back up your bookmarks and such. Usually, an older version of Firefox will be able to read your data, but this is not guaranteed.

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