more info: https://developer.chrome.com/docs/extensions/mv3/themes/
// Strings used by themes to identify colors in the JSON.
constexpr StringToIntTable kOverwritableColorTable[] = {
{"frame", TP::COLOR_FRAME_ACTIVE},
{"frame_inactive", TP::COLOR_FRAME_INACTIVE},
{"frame_incognito", TP::COLOR_FRAME_ACTIVE_INCOGNITO},