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This bug has been copied from bug#2126044 and will be backported to the 8.6.0 Z-stream.

Description of problem:

Firefox Nightly now reports unsupported CSS selectors. Since that fix was implemented, Firefox Nightly users can no longer log in into Cockpit, the login page just shows:

   This web browser is too old to run the Web Console (missing selector(:is():where()))

This is due to a bad CSS capability check in Cockpit's login page.

See this issue for details: https://bugzilla.mozilla.org/show_bug.cgi?id=1790259

Chromium is affected in the same way.

Current *releases* of Firefox and Chromium are fine still, but it is expected that the upcoming versions will contain this change.

Version-Release number of selected component (if applicable):

cockpit-ws-275-1.el9

How reproducible: Always


Steps to Reproduce:
1. Try to log into Cockpit with Firefox nightly

Actual results: Login page shows the error above, login is not possible.

Expected results: Login should work normally.

This was reported upstream in https://github.com/cockpit-project/cockpit/issues/17724 and fixed in https://github.com/cockpit-project/cockpit/pull/17726

*** Bug 2136679 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (cockpit bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7113