[BUG] Chromium-based browsers seem to misidentify the theme's color mode.

[yum13241]

The Problem

The theme doesn't communicate its darkness to Chromium-based browsers, such as Thorium Browser. This causes websites to think you prefer light mode, when the user probably doesn't.
However, Firefox-based browsers do know that Simplewaita is in-fact, a dark theme.
This is most likely due to the fact that Firefox-based browsers use GTK3, while Thorium allows the user to pick GTK, Qt, or Thorium's own styling. None benefit the matter here.

How To Reproduce

1. Get Thorium Browser.
2. Use the Simplewaita theme. (Apply it through Kvantum, which you apply with qt5ct and qt6ct, and apply it through Xfce's Appearance menu)
3. Repeat Step 1, but just browse around and get blinded (if you aren't, clear your cookies.)

How To Avoid This Bug

• Use a Firefox-based browser.
• Don't use the theme. Chromium-based browsers detect Adwaita-dark just fine.

You also may want to see Alex313031/thorium#911.