Desktop (Windows, macOS, Linux):
1. Open a website that supports PWA (e.g., Twitter, Spotify, or any PWA-enabled site).
2. In the address bar, a “+” icon will appear on the right (or “Install” in the menu).
3. Click the “+” icon or go to the menu (three dots in the top-right corner) → “Install app.”
4. Confirm the installation in the pop-up window.
5. The app will appear on your desktop or in the applications menu.

Android:
1. Open a PWA-supported site in Chrome.
2. A banner saying “Add to Home screen” will appear — tap it.
3. If no banner appears, go to the menu (three dots) → “Add to Home screen.”
4. Confirm, and the app icon will appear on your home screen.

Desktop (Windows, macOS, Linux): 
Firefox doesn’t fully support installing PWAs as standalone apps on the desktop. However, you can:
1. Open a PWA-enabled site.
2. Manually create a shortcut: right-click on your desktop → “New Shortcut” → paste the site URL → name it.
3. Some PWAs will work offline if the developer has enabled this feature.

Android:
1. Open a PWA site in Firefox.
2. Tap the three dots in the top-right corner → “Install” or “Add to Home screen.”
3. Confirm the installation, and the icon will appear on your home screen.

Desktop:
1. Open a PWA-supported site.
2. A “+” icon will appear in the top-right of the address bar, or go to the menu (three dots) and select “Install this app.”
3. Click the icon or select the menu option.
4. Confirm the installation, and the PWA will appear as a standalone app in the Start menu or on your desktop.

iOS (iPhone/iPad):
1. Open a PWA site in Safari.
2. Tap the “Share” button (square with an upward arrow) at the bottom of the screen.
3. Select “Add to Home Screen.”
4. Customize the app name and tap “Add.”
5. The icon will appear on your home screen.

macOS: 
Safari on macOS doesn’t support installing PWAs as standalone apps. You can add the site to bookmarks or pin the tab for quick access.

1. Open a PWA-supported site.
2. A pop-up notification saying “Add to Home screen” will appear — tap it.
3. Alternatively, go to the menu (three lines) → “Add to Home screen.”
4. Confirm, and the app icon will appear on your home screen.