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Mostly works Rated 4 out of 5 stars
Was able to change icons of firefox bookmarks successfully, but also got some weird behavior, such as icons of seemingly random file types in Explorer & the start menu being changed to Favicon icons.
For instance, I had to install a quicktime update, and after the install all the icons of the quicktime shortcuts were set as one of my user-made icons that I had chosen for some bookmarks in FF.