A new release of Vivaldi features enhancements to theme support, including theme scheduling. Panels can now be different widths, and middle-clicking the garbage icon now restores the most recently closed tab.
Wait. Theme scheduling? Does anyone really need this? Frankly, I wish the Vivaldi developers would focus on the core issues, like tabs, bookmarks, and link handling, which are still a mess, in my opinion. Why is Vivaldi the only browser that doesn’t highlight the contents of the address bar on right-click?
The Vivaldi 1.4 release announcement has additional details, including a complete list of changes.