How do I disable a new Firefox update is available popup?

To disable "a new Firefox update is available" popup, as well as disabling updates completely from within Firefox, and disabling Firefox from updating itself, add the following registry entries in Windows 10 (I have not tested this in other versions of Windows): Close Firefox before proceeding. Launch Windows Registry Editor.

Why do I get a pop-up on Firefox?

If you see the address bar with the Tracking Protection button and the Site Identity button in the pop-up window, the pop-up is coming from Firefox. If you don't see these buttons, you may have malware on your computer that causes the pop-ups.

How do I know if my Firefox is out of date?

If you start Firefox and see a notification bar with a Heartbeat icon, the message Your Firefox is critically out of date. An update is required to stay secure and an Update Now button, this is a legitimate Firefox update notice and you should update Firefox.

How do I check if Firefox updates automatically?

Firefox updates automatically by default but you can always check for updates at any time. Click the menu button at the right side of the Firefox toolbar, go to Help, and select About Firefox. In the menu bar, open the Firefox menu and choose About Firefox. window will open. Firefox will check for updates automatically.