300-400 "Error caught in Sync Tab Groups" notifications is probably enough

[ApopheniaPays]

I tried to open the latest Firefox about a half hour ago on MacOS 10.14.6. Apparently Sync Tab Groups has been updated since I last opened it. I've seen probably 1000 "Error Caught In Sync Tab Groups" notifications, and the browser is still totally frozen a half hour later, doing nothing giving me these errors.

I'd say 300-400 of the same error popup in a row is probably nearly enough for most people to get the message it's trying to give. There's no reason to show more than that. You might want to put some sort of limit in.