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The fix from that article has to do with how one would go about setting a different default browser. Earlier, they had to do this by associating the browser with filetypes, so, someone would have to make multiple changes to fully set their browser default. Now, you can just set the browser like you would think.

The issue at hand though has to do with other links within windows that open web pages. Microsoft had used a different protocol (not https, but, something like microsoft-edge://). I think these links are like news items that show up in the start menu, etc. There was no way to set Firefox to open these links with what Windows provided, it only opened in Edge. A program was written that listens for these protocols, and would let the user customize what program opened with those links were clicked. Microsoft has now shut that option down.