I don't know, whether this has been posted before, but I dug a bit and nothing came up so here we go…
I think it would be super duper handy to have the "Bookmark" option also include a small screenshot of the bookmarked website as a thumbnail, rather than a random image from the site, which is usually pretty pointless (buttons, ads…)
This would make visually browsing bookmarked websites way easier and the absence of this feature is why I don't use the "bookmark" function as much as I should be.
(I am aware of the "screenshot" option, that's how I made the left pane. But "bookmark" also adds more info of the website, which is quite handy, so, not the same)