By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.
https://www.mozilla.org/security/advisories/mfsa2020-35/
https://www.mozilla.org/security/advisories/mfsa2020-33/
https://www.mozilla.org/security/advisories/mfsa2020-32/
https://www.mozilla.org/security/advisories/mfsa2020-31/
https://www.mozilla.org/security/advisories/mfsa2020-30/
https://bugzilla.mozilla.org/show_bug.cgi?id=1634872