The chrome extension icon should be able not only to show if a specific URL is already in the bookmark list, but also if the overall domain is already bookmarked. Right now if a page is bookmarked a blue check marks appear on the icon extension, it would be nice to have a violet or grey one to show that the domain is already in your bookmarks.
You'll still have the possibility to add specific subpage in the bookmarks, but in this way removes the problem of saving a million time the same website because you're visualizing a different page.
Particularly important when you are saving for example a agency website, and you just care to save the link to the domain but maybe you are already deep in the case studies of the agency.