IDMcc for Firefox Update - IDMcc for Firefox 70 beta, Firefox 69, 68 and older versions with Web Extension support and legacy addon. - IDM CC 6.35.5 Internet Download Manager (IDM) Firefox integration addon (IDMcc) update compatible with Firefox 70 beta, Firefox 69, 68 and older versions with Web Extension support and legacy addon.. IDM cc for Firefox 70 beta, Firefox 69, 68 and older versions with Web Extension support and legacy addon.. IDMcc version IDM CC 6.35.5