Sounds like an IE11 issue, not a RH one. What does google say about IE11 and favicons?
Thought I had replied to this earlier. Looks like it was a figment of my vast imagination. LOL
See if this link helps...
Like many other things, seems IE doesn't play like the others.
I checked Google and previous RH posts, and tried the recommendations I saw (listed above). None worked. I will add one curious observation. When I deleted the bookmarked site, the icon associated with the bookmarked site (see Favorites > OMD_SEQ in image below) updated to the favicon (named myicon.ico) in IE 11 but the favicon on the tab (which I would have thought would have had to be the same icon since I am not specifying any other icons) is still the default IE icon (see tab in image below).
This would seem to suggest to me that IE found the favicon (myicon.ico) and recognized it as a valid icon file (which I know it is).
I'm wondering if IE just doesn't pick up the favicon for the browser tab if the web page is being viewed locally.
I wondered the same thing about viewing locally.
I thought I saw a reference to someplace saying that IE didn’t play well with local HTML pages & favicons, but I lost the page where I saw it. Grrr!