Active tab visibility. Please give it more contrast or give it a colour

I can’t see which tab is active. When I have a lot of tabs open and want to close the current one it takes me forever to find it. The contrast is way too weak.

It seems like a lot of people have had this problem for years. This is literally the only problem I have with this browser (I’ve been using it a week or so). Pleeaaaase fix it. Can’t be too hard! It would be great if the user can choose his own colour for the active tab.

Here’s a partial image:

I also would like to see more contrast to the active tab in dark mode.