Microsoft Edge browser already allows to import bookmarks of Chrome, Firefox and Internet Explorer into the browser, do you want to export Edge favorites to an HTML file, so that you can later import them into Chrome or Firefox or any other browser, here is how you can do that.
Exporting Edge browser favorites to an HTML file
1. Open Microsoft Edge browser, click on more actions menu (…), select Settings, click on ‘View Favorites Settings‘ under Favorites,
2. Under import or export a file, click on Export to file.
3. When Save As dialog pops up, choose a location, give a new name to the file or leave as Edge_ favorites and click Save, done.
Note: The latest insider build 14926 for Windows 10, offers this feature.