Tor: How do I report a Tor Browser problem?

Short answer

Check the Tor Project's troubleshooting and known-issues pages first. Note your Tor Browser version, operating system, the exact error, and whether the problem occurs on every site or one site. Tor's help materials explain how to collect logs for connection failures. Remove personal details from screenshots and logs before sharing them with a public issue tracker.

Sources

Tor Project: Troubleshooting, Tor Project: Known issues.