Issue with sidebar_highlight

Hello !
I am creating a theme for Firefox and I wanted to change the sidebar highlight color. So I checked on the “theme” page of the web doc, and the property seems to be “sidebar_highlight” ; I added it to my manifest.json file, set the property to “green” and I loaded it with the about:debbuging page.
However, the sidebar highlight color is still blue, so I wonder where the problem is ? Below a screenshot of the situation :

Thanks for your help :slight_smile: