SEC_ERROR_LIBRARY_FAILURE in Tor Browser 10

Users are reporting issues loading some HTTPS websites:

• https://support.torproject.org: https://twitter.com/mistercourt/status/1309486809353785344
• https://duckduckgo.com: https://www.reddit.com/r/TOR/comments/izan94/just_got_the_new_update_and_now_tor_wont_index/

where they receive an about:neterror page with Error code: SEC_ERROR_LIBRARY_FAILURE. This error code is used for many reasons. We'll need some specific information about a failed connection using increased logging.