Check whether Tor Browser upstream has considered improving their errors message

Maybe upstream Tor Browser would be interested or has already considered diplaying more informative error message in the particular context of Tor (eg. when accessing LAN, when Tor is not ready yet, etc.).

Or if we design a solution they might be interested in including it upstream because they face similar issues.

Parent Task: #8711 (closed)

Original created by @sajolida on 8712 (Redmine)