Just doing some more testing and tried this plugin on a test site. This test site has a js function that for each link checks an external site and grabs an icon depending on the link. It then inserts the icon into the page and displays it to the user.
With the Front end Editor plugin, because this js function loads, it loads the icons correctly, but then upon saving the post, these icons are also saved. Therefore when the page is viewed and the links are checked and inserted, there is a double-up of said icons.
What would be a workaround?