Interesting idea. Advanced settings are not as advanced as I would like for this to be actually usable. Time delay settings would be nice or a setting to wait until the tab is finished loading. Lots of false changes when the site is redirecting and flashing when it could be resolved by waiting a second. Turning off Dynamic Update of the tab color still sometimes has the tab color update, maybe when opening a new tab, but still distracting and against my wanted behavior. Amazing attempt, maybe Firefox's design disallows the true potential of this idea. I want a browser to do this seamlessly now.

Edit: appreciate the response!