Ran a previous version of FF, then closed and ran regular (5.0) version, but some add-ons, toolbars, and other stuff has disappeared. How can I get this stuff back?

I have been running 5.0 great for a while now, but today I tried downloading and running FF 3.6. As it was opening it stopped responding, but then I tried to force quit but then it worked and loaded up the pages I had open on 5.0 when I closed it.
I then closed the 3.6 version and ran the 5.0. I noticed a few things were gone or different...
~Several add-ons/extensions and toolbars were gone. Some of them were: Adblock Plus, Read it Later (and all its saved pages), Stumble Upon toolbar.... and more I am not sure of...
~Some of the saved sessions in my Session Manager add-on were gone.
~FF 5 seems to not be asking if I want to save my pages whenever I quit.
~The settings for how my tabs appeared has changed also... Like the color of text and where a new tab goes when I click on a link (to the right of the current tab or all the way to the right)... I am not sure if this is because of an associated add-on/extension being deleted.
UPDATE: I checked my profile folder and all of the extensions' data is all still there but FF5 is just not reading it correctly. (like adblock plus... I see the folder for it but FF5 doesn't have it on the add-on manager page when I run FF5) (The stumble upon toolbar folder is also in my profile folder but is not showing up in View->Toolbars when I actually run FF5)
Any help would be extremely appreciated.
Thanks!

Thanks but I don't think this will help. Like I said, all of my add-ons were working fine and compatible until after running a previous version of FF. I am sure they are still compatible, but they are not working at all.
I even checked my profile folder and all of the extensions' data is all still there but FF5 is just not reading it correctly. (like adblock plus... I see the folder for it but FF5 doesn't have it on the add-on manager page when I run FF5)

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