Installed Firefox 5, Receiving Incompatible Add-Ons Window

I just installed FF 5 and after clicking on the shortcut I receive a window "Incompatible Add-Ons" with the following listed:
Garmin Communicator 2.9.2
MS NET 1.2.1
Adobe DLM 1.5.2.35
Adblock Plus 1.3.3
The 4 addons were automatically disabled. I then clicked on Check Now and the following updates wee found:
Garmin Communicator 2.9.3.1
Adblock Plus 1.3.9
I installed these 2 and received a message that FF encountered problems when updating some of your add ons. I reviewed the add ons and the Garmin Communicator 2.9.3.1 did not install. Has anyone else encountered this issue? If so, how did it get resolved?

Either an add-on (or you) set an override for your Firefox version. To clear that:
(1) Type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the filter box, type '''usera''' and pause for Firefox to filter the list.
(3) Right-click and reset any bolded lines that contain "override"
Any luck?

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