I probably should have specified that I meant the UI. You can do everything in Firefox, but for me, the Chromium UI just looks nicer, it's "cleaner" for me, even if it comes at the cost of having the address-bar in a submenu, for example. Because I use the bookmark-manager quite often, that's a majority points I consider. For 99% of the people, Firefox will do the job just as well as Chromium especially if you just use the bookmarks, not the manager. For some it probably looks even better. It's just preference.