Firefox No Longer Opens on Mac

Using Firefox on OS Sierra when suddenly no longer able to open it. After deleting all profiles and creating a new profile by
running profile manager from Terminal, it will open. Hovever upon quitting Firefox it will no longer reopen and the entire routine must be performed again. Terminal states:###!!! [Parent][PImageBridgeParent] Error: RunMessage(msgname=PImageBridge::Msg_WillClose) Channel closing: too late to send/recv, messages will be lost

192:~ danlach$ _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.


1 Like

same here, on Mojave

Hi @dan.lach @brac71_DK

This discourse channel is mostly about Firefox Developer Tools. Could you either file a Bug at or maybe join the chat on Elements at ?

I’ll relay your post there for now.