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Firefox update check can't talk to the mothership (likely)

I run Firefox on a number of systems and two of my work computers seem to be unable to check in with the Firefox update servers to get updates. See image for the exact error message. "Firefox can't update to the latest version. Download a fresh copy of Firefox and we'll help you to install it." My suspicion is my network team is blocking my browsers from getting to the Firefox update servers but I don't know how to test it. One of my browsers is 77.0, the other is 77.0.1. Both of them give me

I am trying to migrate from Thunderbird under Windows 7 to Thunderbird on Mac OS (High Sierra). Need to move profile info to the new machine

Not sure if this is the correct place to post my question, given the separation of Thunderbird from Mozilla. If this is not the right place, I'd appreciate a link to the correct one. I'm new to Mac OS, have been a long time Windows-7 user, and long ago was a UNIX user at my then employer. But it's past time to say goodby to Redmond. I want to transfer my Firefox Thunderbird email history as well as my address book etc. from the Windows 7 installation of Firefox Thunderbird, (which says it's "