Some web pages display a small image (PNG, etc.) in the page tab title, address bar, or browser bookmarks. This image is called a favorites icon or Favicon for short. Here's a step-by-step guide on ...

Add browser functionality using JavaScript enabled bookmarks…without installing a plugin or extensions.

Unfortunately, not all sites can be installed as Progressive Web Apps. However, some browsers, such as Brave, allow you to launch a site without all of the standard browser accoutrement.