Circuit Information is not displayed on Firefox error pages

The issue Circuit information is not displayed on Firefox error pages "Untrusted Connection" or "Problem Loading Page".

Why does that matter? User encounters a suspicious SSL error:

• User can no longer visit an IP discovery website because Tor Browser will use a different circuit and,

• Tor Browser does not display the circuit information.

It's then difficult for the user to determine which exit they were using when they encountered the suspicious behavior.

This obstacle might ultimately prevent users from investigating suspicious exits or making BadExit reports to Tor.

Recreation/Versions

Behavior described can be observed at https://mjvmobile.com.br/ (SSL error) or any domain that wont load. Clicking TorButton does not display circuit information while on the error page.

This happens reliably with Tor Browser 4.5 (Windows).