Firefox keeps prompting me for password with the popup

Question

Firefox at my work computer keeps prompting for password with the popup message "The proxy moz-proxy://proxy:9119 is requesting a username and password. The site says: "moz-proxy://proxy:9119"" This happens too often,even If i provide the username and password I get the next popup with same message.
Its very annoying, I am not finding web better because of this, I goggled and figured about the config settings of - network.automatic-ntlm-auth.allow-proxies and the other one not working.
I guess I am missing the PAC URL or something which I remember like solved the problem sometime back but not in same domain though.
Can someone help ?
Can the good community help ?

Answer 1

Quitting Calendar Agent is not working for me. I still get the following errors.
About 50 of these: 8/13/12 10:19:28.210 AM CalendarAgent[12480]: Unexpected EOF, returning last token as fallback
Then about 10 of these:
8/13/12 10:19:31.193 AM CalendarAgent[12480]: [com.apple.calendar.store.log.caldav.queue] [Account refresh failed with error: Error Domain=CoreDAVHTTPStatusErrorDomain Code=401 "The operation couldn’t be completed. (CoreDAVHTTPStatusErrorDomain error 401.)" UserInfo=0x7fb603b9d990 {AccountName=, CalDAVErrFromRefresh=YES, CoreDAVHTTPHeaders=<CFBasicHash 0x7fb603f5a4b0 [0x7fff79a05190]>{type = immutable dict, count = 10,
entries =>
    0 : Case Insensitive Key: X-Content-Type-Options = <CFString 0x7fb6038d0650 [0x7fff79a05190]>{contents = "nosniff"}
    1 : Case Insensitive Key: Content-Type = <CFString 0x7fb603bd3930 [0x7fff79a05190]>{contents = "text/html; charset=UTF-8"}
    2 : Case Insensitive Key: Server = <CFString 0x7fb603b1c400 [0x7fff79a05190]>{contents = "GSE"}
    3 : Case Insensitive Key: Transfer-Encoding = <CFString 0x7fff792226b8 [0x7fff79a05190]>{contents = "Identity"}
    6 : Case Insensitive Key: Date = <CFString 0x7fb603bf6300 [0x7fff79a05190]>{contents = "Mon, 13 Aug 2012 14:19:31 GMT"}
    7 : Case Insensitive Key: X-Frame-Options = <CFString 0x7fb603869680 [0x7fff79a05190]>{contents = "SAMEORIGIN"}
    8 : Case Insensitive Key: X-XSS-Protection = <CFString 0x7fb603b01740 [0x7fff79a05190]>{contents = "1; mode=block"}
    9 : Case Insensitive Key: Www-Authenticate = <CFString 0x7fb603bcf200 [0x7fff79a05190]>{contents = "BASIC realm="Google CalDAV""}
    11 : Case Insensitive Key: Cache-Control = <CFString 0x7fb603b08d50 [0x7fff79a05190]>{contents = "private, max-age=0"}
    12 : Case Insensitive Key: Expires = <CFString 0x7fb603bf8a20 [0x7fff79a05190]>{contents = "Mon, 13 Aug 2012 14:19:31 GMT"}