Introduced last week, Vivaldi 2.0 is a major update that delivers essential features like Sync, Resizable Tab Tiling, and Floating Web Panels to this niche browser, as well as a fresh look with window background images and Start Page backgrounds. Vivaldi is now available for macOS, Windows, and Linux.
https://www.notebookcheck.net/Vivaldi-2-0-now-available-for-download-with-Sync-Resizable-Tab-Tiling-Floating-Web-Panels-and-more.336656.0.html
Only feature missing now is firefox-style Bookmark Tags...with the option to import them from Firefox.
If it does implement Bookmark Tagging, I will be ready and willing to finally ditch Firefox, which has become a huge disappointment.