ok siropu say he cannot see problem in his add-on
i disabled his add-on again and enabled, and now i cannot reproduce the error, so he is right, his add-on is not causing problem, so it was my mistake, his add-on is not the problem
so i downloaded 4 different browsers, 3 browser have the same problem,
the only browser that works and changes the color right away is "brave browser", i dont know why the 3 other browsers are having this caching problem
firefox on left, brave on right
edit, ok after 10 minutes, it change the color, and then it change back to before color,
i dont know why, it gives me many problems
i don't understand browser cache
.