If you are going to do an upgrade, copy the entire mango directory, bzip it if you have to so then you have a working backup on the mango unit itself. You can do this over ssh assuming you have remote shell access.
Alternatively, stick with Firefox as its only google chrome that is pulling this jazz.
To be honest though, I would stay with 3.5 as there are still a number of issues on 3.7 that haven't been fixed as the dev team are swamped with mango 4Beta.
Just use a different web browser.
Fox