Ideally, the images should be around 512x512 to look the best. Replacing the Icons Once you have an image to use, open the “Applications” folder in Finder and locate the app you want to customize.

Here's how you can design custom cases, themes, icons, and more to change your iPhone both inside and out. ... Simply rename the new 512x512 pixel icon with the name [email protected], delete ...

Elsewhere in Vivaldi 6.0, the browser's built-in theming tools have been upgraded to include new Custom Icons, which can be found in the Themes Gallery.