http://community.foscam.com/forum.php?mod=viewthread&tid=1055 Apparently that IPCWebComponents has a Plugin for Firefox. Firefox 51 and later Release versions don't support any Plugins except for Flash. The Firefox 52 ESR version does support all or most Plugins. ''ESR = Extended Support Release'' But come May 2018 when ESR advances to the next version, that support will end, too. ESR is available here: https://www.mozilla.org/en-US/firefox/organizations/all/ But you may experience a minor problem going back from Fx 57.0.2 to ESR 52, certain incompatibilities exist.