While Vivaldi 5.0 for Android becomes the world's first mobile browser to introduce two-level tab stacks, as well as desktop-like Panels for tablets and Chromebooks, its desktop sibling comes with a fully reworked theme editor, theme sharing, a translate panel, as well as a download pop-up on the address bar.
https://www.notebookcheck.net/Vivaldi-5-0-comes-with-a-revamped-theme-editor-and-theme-sharing-translate-panel-and-more.583622.0.html