This worked. While I was dealing with this, the tab eventually came alive again, and I was able to upload the profile :-) https://share.firefox.dev/4cDpgpd
Bug 1885010 Comment 5 Edit History
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Your description worked. While I was dealing with pasting it somewhere, the tab eventually came alive again, and I was able to upload the profile :-) https://share.firefox.dev/4cDpgpd