Bing is a search engine. Remove the search engine from your browser. You may also inadvertently be clicking on something on a page that will make bing be your homepage, which is my theory here since I just read the original thread you created back in May. As long as you have your default browser set up correctly in default apps and remove bing from the search engines available in that browser then you should be fine. If you are using firefox as your default browser then make sure you have it setup correctly per the following images.
Highlight bing and then click on remove. Once you select firefox as your default browser, no other browser should open when clicking on links. If firefox isn't listed as it does in the pic then you just click on the box and change it to firefox. See image 3. Also do this. Open task manager, Click on the startup tab, disable any items that are related to Edge. Sometimes it will show up here and auto start in the background.