As to the tab management, older version of Opera had tab stacking, which I've found pretty good for tab management. You could stack tabs into themselves to crea

As to the tab management, older version of Opera had tab stacking, which I've found pretty good for tab management. You could stack tabs into themselves to create a cluster of tabs that could then be rolled, so that just one of the tabs was visible, and later unrolled for using those tabs. I think Vivaldi copied the feature as well.