What extension should I use to parse a prepared list of pages and notify (me) about visiting a page from the list?

Question

Mozilla Firefox

Please tell me a way or an extension for mozilla so that a page that is already on the list is somehow indicated. Well, i.e. I went to the page -> saved the link, or automatically saved. Then, having visited this page, the extension sees this page in the list and notifies. Of course, some extensions with proxies work according to this principle, but my task is simpler, it would seem.

Answer 1

It's not entirely clear why this is needed.
and you can make a script that, when opening a page, will check the bookmark links,
if the page we went to / opened is in our list,
then the alert window pops up ('there have already been there, the address is in the bookmarks ')
ps
you can check not only the address, but the title of the page,
this will solve the problem with pages added under the proxy,
instead of a simple message that the page is bookmarked,
you can also display information about when it was added, etc. etc.