Refresh Bookmark Favicons
Forcing Favicon refresh in Bookmarks in Firefox and Chrome browsers
Najjednostavnije rešenje je da add a slash after the URL so the browser loads the page from ground up again.
Solution retrieved from Stack Overflow as the simplest and most straghtforward. Author pointed at “Method 2” mentioned in original source article: Fix: Firefox Displaying the Wrong Bookmark Favicons
Ima još mnogo predloga, na primer: How to refresh bookmark favicons in chrome - Super User