Firefox 93: background color for selected text is changed to light blue, overrides system settings

Previously with Firefox 92 and earlier background colour for selected text was as in system settings (i.e. in all other pograms).
Now it is light blue (and white letters).
Selecting in address bar and in system pages (about:support, about:preferences) works as expected.

FF 91.2.0esr text selection works OK in that case.

How to solve this issue?

Bug 1191623]( is filed.