Hang in writeBytes() with Firefox 85

I tested my patches for tor-browser-build#40168 (closed) and it turns out that Tor Browser is not starting up. It's just sitting at:

Jan 03 17:26:20.000 [notice] Bootstrapped 0% (starting): Starting
Jan 03 17:26:20.000 [notice] Starting with guard context "default"
Jan 03 17:26:20.000 [notice] Delaying directory fetches: DisableNetwork
is set.

After some back and forth it turns out that it is hanging in aConn.binOutStream.writeBytes(cmd, cmd.length); in tl-protocol.js's _sendCommand().

Edited Jan 03, 2021 by Georg Koppen

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information