Whether clicking on the toolbar icon, the desktop icon, or the listing in search results, the same thing happens: the loading icon briefly appears, and then it's as if I didn't click anything at all. No browser window, no error message, nothing. I've restarted my computer. I've run a security scan and found nothing. I've uninstalled and reinstalled Firefox. I've created a new profile and tried to start Firefox with it. None of these methods has made any difference.

Any help would be much appreciated. I'm using Windows 10.