Vivaldi today released v5.0 of its browser for Android. The major new change in this version is the introduction of double tab bars, borrowed from the desktop version of the app. With two tab bars, users can now have one row for tab stacks and the second row for the tabs within. Stacks allow the user to group together a bunch of related tabs and then you can cycle between stacks instead of individual tabs. You can simply drag tabs on to one another to create a tab stack. You can also manage how the tabs appear. You can disable the X button to close the tab on all but the current...
Source: https://www.gsmarena.com/vivaldi_50_for_android_brings_two_rows_of_tabs-news-52116.php