Firefox keeps on crashing, - 4 times in an hour! Please help

Question

Recently upgraded to 4.0b6 and Firefox keeps on crashing. It starts out by getting progressively slower and slower, then freezing for a few seconds, then just crashes and all tabs close. On restart everything is mostly saved and I can continue working, but it's impossible to work this way. I doesn't seem linked to any specific site/action.
I have spent a fortune on technician to find malware/viruses and optimise my laptop, but it doesn't seem to help.

Answer 1

7th Cash......
AdapterDeviceID: 2a42
AdapterVendorID: 8086
Add-ons: [email protected]:1.0.2.29661,{20a82645-c095-46ed-80e3-08825760534b}:1.2.1,{75656794-AB59-4712-BFBC-5D816D56F3BC}:1.1.6,{ef4e370e-d9f0-4e00-b93e-a4f274cfdd5a}:1.4.1,[email protected]:1.1,{5C46D283-ABDE-4dce-B83C-08881401921C}:2.1.6,[email protected]:1.1,[email protected]:1.76,{CAFEEFAC-0016-0000-0020-ABCDEFFEDCBA}:6.0.20,{CAFEEFAC-0016-0000-0021-ABCDEFFEDCBA}:6.0.21,{CAFEEFAC-0016-0000-0024-ABCDEFFEDCBA}:6.0.24,[email protected]:0.8.2,{972ce4c6-7e08-4474-a285-3208198ce6fd}:4.0
AvailableVirtualMemory: 1514549248
BuildID: 20110318052756
CrashTime: 1301417540
EMCheckCompatibility: false
Email: [email protected]
FramePoisonBase: 00000000f0de0000
FramePoisonSize: 65536
InstallTime: 1301324819
Notes: Cisco VPN
AdapterVendorID: 8086, AdapterDeviceID: 2a42, AdapterDriverVersion: 7.15.10.1518
D3D10 Layers? D3D10 Layers-
D3D9 Layers? D3D9 Layers-
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 9740
StartupTime: 1301409960
SystemMemoryUsePercentage: 70
Theme: classic/1.0
Throttleable: 1
TotalVirtualMemory: 2147352576
URL: wyciwyg://13/http://talkgadget.google.com/talkgadget/notifierclient?client=sm&prop=iGoogle&nav=true&fid=gtn-roster-iframe-id&ts=0&debug=undefined&os=Win32&stime=1301417173105&fb=false&re=false&no=undefined&hc=true&ref=true&xpc=%7B%22cn%22%3A%221r9cje%22%2C%22tp%22%3A1%2C%22ifrid%22%3A%22gtn-roster-iframe-id%22%7D&pvt=undefined&href=http%3A%2F%2Fwww.google.com%2Fig%3Frel%3D1%26refresh%3D1&css=http%3A%2F%2Figoogle-skins.googleusercontent.com%2Fig%2Fskin_xml_to_css%3Fhl%3Den%26gl%3Dus%26v2%3D1%26url%3Dhttp%3A%2F%2Fighosting.googlecode.com%2Fsvn%2Ftrunk%2Fxml%2Fartist_yves_behar.xml%26skindx%3Dix%3A9%26fp%3DXFyN3r2ZBJ0&hl=en&uj=SPilcher%40gmail.com&vp=http%3A%2F%2Fwww.google.com%2Fig%2Ftalk_xpc_blank.html&host=1&zx=a1lpepcdllhl
Vendor: Mozilla
Version: 4.0
Winsock_LSP: MSAFD Tcpip [TCP/IPv6] : 2 : 1 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [UDP/IPv6] : 2 : 2 :
MSAFD Tcpip [RAW/IPv6] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
MSAFD RfComm [Bluetooth] : 2 : 1 :
MSAFD Tcpip [TCP/IP] : 2 : 1 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [UDP/IP] : 2 : 2 :
MSAFD Tcpip [RAW/IP] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
RSVP TCPv6 Service Provider : 2 : 1 :
RSVP TCP Service Provider : 2 : 1 : %SystemRoot%\system32\mswsock.dll
RSVP UDPv6 Service Provider : 2 : 2 :
RSVP UDP Service Provider : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{E073C859-A14D-4B41-B8AF-1C8D44B92125}] SEQPACKET 13 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip_{E073C859-A14D-4B41-B8AF-1C8D44B92125}] DATAGRAM 13 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{044D5AE6-C310-42E8-A212-FF1FA4F2F8E1}] SEQPACKET 9 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip_{044D5AE6-C310-42E8-A212-FF1FA4F2F8E1}] DATAGRAM 9 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{2C64ACBF-FC1F-492A-8A1C-92C908CA859C}] SEQPACKET 7 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip_{2C64ACBF-FC1F-492A-8A1C-92C908CA859C}] DATAGRAM 7 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{236067B1-36D8-4A93-B81E-15578AC7C014}] SEQPACKET 4 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip_{236067B1-36D8-4A93-B81E-15578AC7C014}] DATAGRAM 4 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{CEF46CC3-C717-42E4-B1B3-565648D70C8A}] SEQPACKET 1 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip_{CEF46CC3-C717-42E4-B1B3-565648D70C8A}] DATAGRAM 1 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{E285D2ED-A4A4-4378-B63C-D1B06A09DE00}] SEQPACKET 3 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{E285D2ED-A4A4-4378-B63C-D1B06A09DE00}] DATAGRAM 3 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{9C45BF9B-893F-4EAB-9027-F59E113142AA}] SEQPACKET 0 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{9C45BF9B-893F-4EAB-9027-F59E113142AA}] DATAGRAM 0 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{748766E1-277B-4F7C-BE44-BD67CD114E60}] SEQPACKET 6 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{748766E1-277B-4F7C-BE44-BD67CD114E60}] DATAGRAM 6 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{712F50CF-EAD3-4467-83D2-84FF7CA1169B}] SEQPACKET 11 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{712F50CF-EAD3-4467-83D2-84FF7CA1169B}] DATAGRAM 11 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{9C9379DC-AA0C-4182-90C4-191C207E2CE7}] SEQPACKET 15 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{9C9379DC-AA0C-4182-90C4-191C207E2CE7}] DATAGRAM 15 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{E073C859-A14D-4B41-B8AF-1C8D44B92125}] SEQPACKET 14 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{E073C859-A14D-4B41-B8AF-1C8D44B92125}] DATAGRAM 14 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{044D5AE6-C310-42E8-A212-FF1FA4F2F8E1}] SEQPACKET 10 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{044D5AE6-C310-42E8-A212-FF1FA4F2F8E1}] DATAGRAM 10 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{2C64ACBF-FC1F-492A-8A1C-92C908CA859C}] SEQPACKET 8 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{2C64ACBF-FC1F-492A-8A1C-92C908CA859C}] DATAGRAM 8 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{236067B1-36D8-4A93-B81E-15578AC7C014}] SEQPACKET 5 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{236067B1-36D8-4A93-B81E-15578AC7C014}] DATAGRAM 5 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{CEF46CC3-C717-42E4-B1B3-565648D70C8A}] SEQPACKET 2 : 2 : 5 :
MSAFD NetBIOS [\Device\NetBT_Tcpip6_{CEF46CC3-C717-42E4-B1B3-565648D70C8A}] DATAGRAM 2 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
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