Bad Request Missing OAuth parameter: client_id Launching FF from LastPass vault and using correct password and email the < Bad RequestMissing OAuth parameter: client_id> popup appears. I am not sure what the correct URL for the FF login page is; I just copied the URL from the sign in page. LastPass launches my other websit sign ins successfully. Kindly advise Robert Apologies for any wasted time. JUST FOUND THAT THE FF SIGN IN URL WAS WRONG. LASTPASS NOW LAUNCHES FF SIGN IN AND ON PASSWORD ENTERED FF ACCT OPENS.