Π Firefox, which will form the basis of the release of Firefox 75, the ability to install and open sites in the form of applications (Apps), allowing you to organize work with the site as with a regular desktop program. To enable about:config, you need to add the setting "browser.ssb.enabled=true", after which the "Install Website as App" item will appear in the context menu of actions with the page (ellipsis in the address bar), allowing you to place it on the desktop or in the menu applications shortcut for a stand-alone opening of the current site.
Development development of the conceptΒ» (SSB), which implies opening the site in a separate window without a menu, address bar and other elements of the browser interface. In the current window, only links to the pages of the active site are opened, and following external links leads to the creation of a separate window with a regular browser.
Source: opennet.ru