Firefox: Previously visited links not grayed out

I’ve tried “help” and Google, but cannot find out why my Firefox browser at home does not gray out previously visited links. My copy at work does, and frankly I can’t tell where the magic check box might be located. Anyone?

Tools / Options / Privacy / Remember Visited Pages…

Mine’s set on 20 days, which I think is the default. After 20 days they go back to the unvisited colour.

Thanks. Although it seems fairly straightforward, I had my “Number of Days” set to zero. That, in turn, would not allow the “Remember Visited Pages” box to remain checked, after I checked it! So, I set it to “1 days” and now it does, in fact work. :smack: