Add a new background image by right-clicking on an image and selecting Use Image as Window Background.
On Android, move the Address Bar to the bottom for easier one-handed access.
Set a unique avatar image for each User Profile.
Add Extensions to Vivaldi from Chrome Web Store.
Change the look of Vivaldi's user interface with custom CSS modifications.
Hold down the Ctrl / ⌘ key to change the location of buttons in the browser's user interface.
On Vivaldi Themes, click on "Download theme" to preview it before installing.