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Thunderbird hangs on startup during first DNS lookup - Mac OS Sequoia

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I get the whirly thing while it says "looking up ...". This problem appeared suddenly without any recent updating and now persists 100% of the time over the last week or so. I cannot access the menu or anything. I tried reinstalling TB with no change. There are no other apps with any network/internet problems. I'm thinking I have to open terminal and do something like clear cache/cookies, etc. but can't figure out what specifically to do to accomplish this. Any other ideas?

I get the whirly thing while it says "looking up ...". This problem appeared suddenly without any recent updating and now persists 100% of the time over the last week or so. I cannot access the menu or anything. I tried reinstalling TB with no change. There are no other apps with any network/internet problems. I'm thinking I have to open terminal and do something like clear cache/cookies, etc. but can't figure out what specifically to do to accomplish this. Any other ideas?

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