Well you say nothing about OS and FF version :)

The blue star only goes blue once a website has been checked by clicking on the [empty] white star.

You can also do a [ctl] + [D] to create the [Blue Star]

Do you have the white star ?

I have the White Star & it used to turn Blue when I clicked on it to save a website to favorites, but no more. OS Windows 11

OK was you on the other post :)

Did you try the key stroke option I noted, you didn't mention trying it ???

So what version of FF and when did you make the change?

Have you restarted Win 11 yet not power off and power on. The later keeps info, restart is a real off and on.

Yes have tried key stroke option , nothing, running latest version of firefox, have not tried restarting machine