With version 5, on starting get a box "checking compatibility of add-ons" then to Firefox home page not my home page--What's happening?

Just installed version 5. As above I get the box then it goes to Firefox home page not my home page. I've updated and/or disabled every add-on or extension and it made no difference. I am in a university behind a tough firewall. I'd love to go back to version 4 but that isn't available.

Disabled add-ons will still be checked and can still be updated.
I don't know why you are continuously getting the message, you should only get it when there is a version change.
You can try solutions in https://support.mozilla.com/questions/817681 but you had better make a list of what extensions you had disabled first, because all of your extensions will be enabled when you delete/rename those files in your profile. You can use about:support to get a list of your extensions. (renaming is safer than deleting).

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