Until about 2 years ago, Firefox seemed the only browser that the filter that had the popup at the top of the page, on a WLC GUI. Then a Firefox update probably "corrected" something, and it's down at the bottom and you need to scroll.
However, Firefox seems to beat out IE, Edge, and Chrome for general WLC usability. Gui consistently displays the whole page including sidebars, without having to periodically refresh the page when the page renders incorrectly on "non-Firefox" browsers.
However, it appears Firefox really doesn't like rebuilding a controller and refuses to allow "self-signed" certificates" that may have changed - only work-around I've found (other than struggling with Chrome for those), is to wipe out the certificate store in Firefox.
