Unable to log because launcher opens an internal web browser that is not accessable

On clicking on "Microsoft Login", it opens a broken web browser. The browser is broken because it does not honor my color theme and loads an overbright and oversaturated page, and doesn't honor the system background color either before the page is rendered.

This is not a Windows system, but the equivalent windows setting is High Contrast Black.

This issue has been filed publicly after Mojang support has closed the private support case after a week of them making no progress and having been hold-abandoned by Microsoft support.

Here are some screenshots of MultiMC able to log in; however this is not a solution because MultiMC is currently not working. Implement this, and you won't have an accessibility bug anymore.