Tor Browser doesn't respect user set changes to Colors and Appearance

A user has reported to the forum and also to frontdesk:

I installed Tor 11.0.14 en(us) version on my Windows 7 Home Premium 64-bit. Because of my bad eyes I use high contrast theme on my computer with yellow text on black background. In Tor browser I immediately went to Settings > Colors and set Text to yellow, Background to black, checked Use system colors and selected Always. The same setting I use successfully in Firefox. But in Tor browser nothing happened. If there is Use system colors checked or unckecked, if there is selected Always or Never, displayed pages don’t change their backgroud nor text colors. Only menus and Settings tab display their colors according to selected Windows theme (text and background colors). Displayed internet pages ignore any color settings made in Tor browser Settings tab.This is completely different behaviour from original Firefox browser. What is the problem here?