robmm76 said

You are wrong.

Well, I can only hope that my fellow contributors will give you the correct answers .....

Actually, sometimes it does work. That comment came after a case when it didn't work. Firefox has gotten so complicated and confused and poorly documented that every random change takes weeks to figure out. This list of dismissed pages is just another time and space waster. I think I'll just go back to using Chrome. There are some nice features in Firefox but they are really not worth the trouble it takes to use them.

Unpin it and delete it from your history.