ModEnc is currently in Maintenance Mode: Changes could occur at any given moment, without advance warning.
Cross-browser compatibility is encouraged, but under no circumstances (except for Administrative Decree) shall a standards-compliant feature be removed because it is not supported by other browsers. Conversely, no feature shall be included that breaks design, code or functionality under Firefox, no matter if it works fine in other browsers.
No user is forced to use or test in Firefox. But be aware that no compatibility is guaranteed for other browsers.