The drop down area is where you see the bookmarks glued in place unable to move them up or down when wanting one ahead of the other without deletion of the first! In order to get the bookmarks bar in order I had to nuke about half of them until the most often used were up on the bar itself and then and only then could be arranged according to use! The "Constant Need" to scroll down through a much longer list of bookmarks then the 17 or so below the bar at this time sees the tabs at both top and bottom as they continue to roll on which can take several minutes! The unassorted bookmarks is where you make a quick save of a page that you want to keep as a reference but not frequent which is where the "Bookmark This Page" option comes in.
As for Opera I still kept the 9..64 version for some VM project that may come up while it's out for every day use! The same thing went for the 32bit FF as well as the Flock browser being another obscure off beat name. The Netscape Navigator could have been a treat if that had been worked on further but at one time AOL only! That was their pet they finally took the lease off of that got dropped off the charts since too many off shoots of Google Chrome and FF came about! Safari for Windows is mostly a Fruit company enticement for Windows users to .... ? Your guess there!
Waterfox proved to be a winner once you worked with it for a period of time having come up from version 9.0 to the just released 40.10 that replaced the 40.02 in a week's time suggesting a fast and thorough support system by the developer who now is starting to be mocked with FF 42 by Mozilla simply incorporating those ideas into their own brand Firefox name. When going to reinstall WF FF 42 actually hampered that when going back one version showing those two are interconnected to each being essentially the exact same thing!
Cyberfox being a close cousin from "Down Under" still seems to be well built but fortunately sees the check box option for the CTR option no one else would want to use. But that is simply a spare browser being looked over for the time being. The appearance is noticeably different as so is Edge.
Edge has jet black however while Cyberfox sees the slight change as a dressing while adding more features and settings into that seen with either Waterfox, FF, or some other FF variant. I'm still trying to locate the exact file location other then finding the MicrosoftEdge.lnk file under user account>AppData>Roaming>Microsoft when seeing it pinned to the Start menu. The file location simply opens the This PC thumbnail in File Explorer while the properties shows nothing in the target line. That got unpnned from the main taskbar by accident one day.