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How automatic browser detection works

Windows

Open With looks for entries in the Windows registry, under the key HKEY_KEY_LOCAL_MACHINE\Software\Clients\StartMenuInternet. It also looks for the presence of Microsoft Edge (Windows 10) in C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe (or if C:\Windows isn't your Windows directory, the corresponding place in your Windows directory).

OS X

Open With looks for .app files in your local applications directory. The browsers it looks for are: Camino, Google Chrome, Chromium, Firefox, Flock, Opera, Safari, and SeaMonkey.

Linux (and others)

Open With looks for google-chrome.desktop, chromium-browser.desktop, firefox.desktop, opera.desktop, and seamonkey.desktop in these locations: ~/.local/share/applications, /usr/local/share/applications/, and /usr/share/applications/.