And yet, throughout my entire history of using Windows, including those dark days of Microsoft's most onerous bundling shenanigans, I was able to install Mozill

And yet, throughout my entire history of using Windows, including those dark days of Microsoft's most onerous bundling shenanigans, I was able to install Mozilla (in its various forms: Netscape, Mozilla, then Firefox) and have it associate with the relevant files. I just ran the installer and approved Netscape/Mozilla/Firefox's prompt to associate with HTML files. On the other hand, I can't seem to easily configure my Android phone to use an alternate app store.