@ikuyanov : and a recent release broke all the videos.

and recent annoying behaviors ( e.g. on image copy-paste ) recently introduced on chrome are now here too.

@aplus : Maybe, but I'm not going to change the window manager or the mouse focus mode for 1 software that doesn't behave correctly and can be replaced by another.

@hwpc48 ubuntu here, maybe that's the reason.
Anyway about opera windows raising on top of others when it shouldn't, apparently the very annoying bug is still there in the 83.0.4239.0 https://forums.opera.com/topic/51465/opera-moves-on-top-of-all-other-windows/14

@leocg : AAAAAaaaaaaah, from the posts order I though avl was answering to my initial post !
Sorry for the mess. ( interface too modern for the old geeks )

→ should I delete the sub-thread I induced ? ( if such thing exist here ).

@leocg : I'm not sure to understand ( maybe I misplaced a comment, or missed an answer ? I'm not used of the structure of Opera forum ).
Anyway my point was not about the fast tab tooltip. And I don't see other answers by you to my question, if you refer to something else.

@leocg : I was talking about the whole window, coming in front on mouse over. Which is a pure bug, not an annoying feature.
Apparently it happens for some window managers, or some configurations of mouse behavior for window managers.

@avl : I'm not sure to understand : are you talking about the point 3, the windows popping on top of others ? if yes:

As my linux window manager is configured ( since forever ), windows come to front only on click, but still get the focus on flyover.
Opera is the first application ever to pop to front just when it happened to be on the mouse way. And this strange annoying behavior even turn pathological when 2 Opera windows are close to the mouse: then they alternatively pop in front at about 60Hz.

@hwpc48 : .31 is what I get when I go on the current opera download page, and what I got at the last auto-update.

" many video are no longer playing ( e.g. twitter ) "

• Including animGifs: e.g. https://twitter.com/i/status/1274579545870368768
• And facebook videos as well. e.g. https://www.facebook.com/groups/procgenart/posts/2510424025755078/

which version is the stable one ?
since the last update ( 81.0.4196.31 / ubuntu 20.04 ) :

• many video are no longer playing ( e.g. twitter )

• the "copy image" feature is no longer by reference when possible ( this also happened to firefox and chrome recently, so I guess it may come from a side library, at least on linux ). So I can no longer post, or even save as draft, my daily newsletter ( rich in web images ).

• the ultra-annoying bug ( present in previous version ) that makes Opera window popup on mouse flyover is still there. With 2 windows, this can even leads to a war between the 2 windows.