Firefox does not have built-in Chromecast support, but you can cast your entire screen or use workarounds to send video and audio to your Chromecast

Firefox does not offer the same direct Chromecast button that Chrome does. However, you have two practical routes: cast your entire screen using your operating system's built-in casting tools, or use extensions and browser features to send specific content. The method you choose depends on what you want to cast—a full webpage, a video, or just your desktop.

The screen-casting approach works on Windows, macOS, and Linux, though the steps differ slightly by system. Extensions exist but are less reliable than native casting and may require additional setup. For most people, screen casting is the simplest option because it requires no installation and works with any Chromecast-compatible device.

Key Takeaways

  • Firefox does not have a built-in Chromecast button, but you can cast your entire screen through Windows, macOS, or Linux system settings without leaving Firefox.
  • Screen casting sends everything on your monitor to the Chromecast, including Firefox, so you see exactly what you are casting in real time.
  • Third-party extensions like Casty exist but are less stable than system-level casting and may not work with all Chromecast devices.
  • If you want to cast only a video without casting your whole screen, check whether the video site itself has a Chromecast button built in.

Casting your entire Firefox screen on Windows

On Windows 10 and later, use the built-in Connect feature to cast to Chromecast. Open Firefox and navigate to the page you want to cast. Press Windows key + K to open the Connect panel on the right side of your screen.

A list of available Chromecast devices will appear. Click the one you want to connect to. Windows will ask you to choose what to cast—select Entire screen. Your monitor will now mirror to the Chromecast, and Firefox will appear on your TV. You can continue using Firefox normally, and everything you do will show on the Chromecast in real time.

To stop casting, press Windows key + K again and click Disconnect. The connection closes when ready.

Casting your entire Firefox screen on macOS

macOS uses AirPlay to cast to compatible devices. Your Chromecast must support AirPlay, or you need an Apple TV. If your Chromecast is AirPlay-compatible, click the AirPlay icon in the menu bar at the top right of your screen.

A dropdown menu will show available devices. Select your Chromecast. macOS will begin mirroring your entire screen, including Firefox. To stop, click the AirPlay icon again and select Turn AirPlay Off.

If your Chromecast does not support AirPlay, this method will not work. Check your device's documentation to confirm AirPlay compatibility before attempting to cast.

Casting your entire Firefox screen on Linux

Linux does not have a universal casting system like Windows or macOS. However, you can use Miracast if your system and Chromecast both support it. The steps vary by Linux distribution and desktop environment.

On GNOME-based systems (Ubuntu, Fedora), right-click your desktop and look for a Cast Screen or Wireless Display option. On KDE Plasma, check the system tray for a network or display icon. If neither appears, your system may not have Miracast enabled or your Chromecast may not support it.

If built-in casting is not available, the extension method described below is your next option, though results vary by setup.

Using Firefox extensions to cast to Chromecast

Casty is the most widely used Firefox extension for Chromecast casting. Install it from the Firefox Add-ons store, then click the Casty icon in your toolbar. A menu will show available Chromecast devices. Select one to begin casting.

Casty works best with video content and some streaming sites, but it is less reliable than system-level casting and may not work with all websites or Chromecast models. Some video sites block extension-based casting for security reasons. If Casty fails to detect your Chromecast or the cast disconnects frequently, switch to screen casting instead.

Other extensions exist, but they are less actively maintained and may not work with current Chromecast firmware. Casty is the safest choice if you want to try an extension.

Casting video directly from websites

Many video streaming sites—YouTube, Netflix, Disney+, and others—have their own Chromecast buttons built into the player. Look for a Cast icon (usually a rectangle with a WiFi symbol) in the video controls. Click it to see available Chromecast devices, then select yours.

This method is more reliable than extensions because the website controls the casting directly. You do not need Firefox to support Chromecast; the website does. If a video site has a Chromecast button, use it instead of screen casting or extensions.

Not all video sites offer Chromecast buttons. If the button is missing, check the site's help documentation or use screen casting as a fallback.

Troubleshooting when Firefox casting is not working

If your Chromecast does not appear in the cast menu, make sure your computer and Chromecast are on the same WiFi network. Chromecast does not work across different networks or when one device is on WiFi and another is on a wired connection.

Restart your Chromecast by unplugging it for 10 seconds, then plugging it back in. Also restart Firefox. If you are using an extension, disable it and try system-level casting instead. System casting is more stable and does not depend on extension updates.

If screen casting works but video playback is choppy or audio is out of sync, move your computer closer to the WiFi router or Chromecast. Interference from other devices or distance from the router can degrade casting quality. Closing other apps that use bandwidth may also help.

Frequently Asked Questions

Why does Firefox not have a Chromecast button like Chrome does?

Firefox and Chrome are built on different engines and have different partnerships with hardware makers. Google owns Chrome and Chromecast, so Chrome has native integration. Firefox does not have this built-in feature, but screen casting through your operating system achieves the same result without needing a browser button.

Can I cast just a single Firefox tab instead of my whole screen?

Firefox does not support tab-level casting. You can cast your entire screen, or you can use extensions like Casty, which may work with some video sites. For the most control, use a website's built-in Chromecast button if it has one.

Does screen casting use a lot of internet bandwidth?

Screen casting sends video over your local WiFi network, not the internet, so it does not consume your internet bandwidth. However, if the content you are casting (like a YouTube video) streams from the internet, that stream still uses your internet connection normally.

What if my Chromecast is not showing up in the cast menu?

Check that your computer and Chromecast are connected to the same WiFi network. Restart both devices. If you are using an extension, try system-level casting instead. If system casting still does not work, your Chromecast may not support the casting method your operating system uses.

Can I cast Firefox to a non-Google Chromecast device?

Most third-party devices that work with Chromecast (like some smart TVs and streaming boxes) support the same casting protocol. However, compatibility varies. Check your device's manual to confirm it supports Miracast (Windows/Linux) or AirPlay (macOS) casting.