I have three Opera wishes! Bear with me ...
Is it possible to ...
(1) Put the Tabs Bar on the bottom row?
(2) The tab closing "X" on the right side of the tab? I found an Add-On for that but it didn't work (I guess with this version of Opera).
(3) Separators within folders? This helps a lot visually in the drop-down view of folders in the Bookmarks Toolbar.
None of that is too much to ask, right?
OS X — El Capitan (Version 10.11.6)
Opera — Version 45.0.2552.888 — Opera is up to date.
Try creating one post for each "wish" and posting it in: