Firefox won't load homepage when launched and crashes when closed.

Question

Last night, while I was in Firefox, a notification popped up that updater.exe had been downloaded. I could easily take a guess: a new version of Firefox was out. I closed Firefox and then had the updater do its thing.
When Firefox then launched & came up with a blank screen (like what you would see with New Tab), I was a little confused. I checked Tools > Options and the general tab was still set to show the homepage when Firefox starts up (Xfinity). I also went through all the other tabs and found that nothing had been changed. It was 18.0, as shown in "About Firefox" so I was scratching my head as to what was going on. Humoring myself, I clicked the "home" Icon, and sure enough it toop me to my homepage. Figuring I'd take a shot at it later, I closed Firefox (The red X in the upper right).
Then things took a stranger turn. Upon closing, the Mozilla Crash Report screen popped up. I figured this was a one-time thing, so I didn't send a report. I launched Firefox again, and again I got a blank screen. Upon closing, the Crash Report screen popped up again. To ensure this was just something with Firefox, I launched Internet Explorer. It showed the homepage upon launch, and didn't crash when closed.
Now, upon getting the troubleshoot information, I discovered another twist: When I go to close one of the tabs, Forefox crashes.
This has me scratching my head. Before I updated, everything was perfectly fine. Now I run into this. Any thoughts?

Answer 1

Alright, I just tried to reset (help > Troubleshooting > click 'Reset Firefox'. It said it would try to hold onto bookmarks, passwords, etc). When it closes, we hit the Crash Report screen again. Launching Firefox reveals nothing has changed (Theme being the same is the give-away). I'd say that hasn't worked as of yet.
I typed about:crashes and copy/pasted everything in the "details" tab. If the "Raw Dump" tab would be more effective, just say so and I'll add that
Signature coffplgn.dll@0x3714
UUID 89ad14cd-e4c9-43d9-9ba0-fa8332130111
Date Processed 2013-01-11 08:26:27
Uptime 27
Last Crash more than 3 months before submission
Install Age 27 seconds since version was first installed.
Install Time 2013-01-11 08:25:31
Product Firefox
Version 18.0
Build ID 20130104151925
Release Channel release
OS Windows NT
OS Version 5.1.2600 Service Pack 3
Build Architecture x86
Build Architecture Info AuthenticAMD family 16 model 2 stepping 3
Crash Reason EXCEPTION_ACCESS_VIOLATION_EXEC
Crash Address 0x54d7048
User Comments
App Notes
AdapterVendorID: 0x1002, AdapterDeviceID: 0x9611, AdapterSubsysID: 00000000, AdapterDriverVersion: 8.531.0.0
D3D10 Layers? D3D10 Layers- D3D9 Layers? D3D9 Layers-
Processor Notes
EMCheckCompatibility True
Winsock LSP
MSAFD Tcpip [TCP/IP] : 2 : 1 :
MSAFD Tcpip [UDP/IP] : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [RAW/IP] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
RSVP UDP Service Provider : 6 : 2 : %SystemRoot%\system32\rsvpsp.dll
RSVP TCP Service Provider : 6 : 1 : %SystemRoot%\system32\rsvpsp.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{0BBE6F70-6FFF-4959-B762-459BA69AE89C}] SEQPACKET 4 : 2 : 5 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{0BBE6F70-6FFF-4959-B762-459BA69AE89C}] DATAGRAM 4 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{CA2BB869-E7F7-405E-9266-0E2BDF8F748D}] SEQPACKET 1 : 2 : 5 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{CA2BB869-E7F7-405E-9266-0E2BDF8F748D}] DATAGRAM 1 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{2FAAFBE0-C5F0-46B6-A02A-3B87402292F7}] SEQPACKET 2 : 2 : 5 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{2FAAFBE0-C5F0-46B6-A02A-3B87402292F7}] DATAGRAM 2 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
Adapter Vendor ID 0x1002
Adapter Device ID 0x9611
Total Virtual Memory 2147352576
Available Virtual Memory 1770160128
System Memory Use Percentage 29
Available Page File 4371468288
Available Physical Memory 2476265472
Bugzilla - Report this bug in Firefox, Core, Plug-Ins, or Toolkit
Related Bugs
783369 NEW --- Norton Confidential 2012/2013 crashes (couictlr.dll, coffplgn.dll)
Crashing Thread
Frame Module Signature Source
0 @0x54d7048
1 coFFPlgn.dll coFFPlgn.dll@0x3714
2 couictlr.dll couictlr.dll@0x28355
3 couictlr.dll couictlr.dll@0x3dcec
4 couictlr.dll couictlr.dll@0x35609
5 couictlr.dll couictlr.dll@0xbe7f
6 oleaut32.dll APP_DATA::AllocCachedMem
7 couictlr.dll couictlr.dll@0x6106b
8 coFFPlgn.dll coFFPlgn.dll@0x590e7
9 coFFPlgn.dll coFFPlgn.dll@0xa812b
10 coFFPlgn.dll coFFPlgn.dll@0x51748
11 coFFPlgn.dll coFFPlgn.dll@0x2bec
12 coFFPlgn.dll coFFPlgn.dll@0x4ef66
13 coFFPlgn.dll coFFPlgn.dll@0xb335b
14 coFFPlgn.dll coFFPlgn.dll@0xc753f
15 coFFPlgn.dll coFFPlgn.dll@0x3c5a3
16 coFFPlgn.dll coFFPlgn.dll@0xa7b00
17 coFFPlgn.dll coFFPlgn.dll@0xa522
18 coFFPlgn.dll coFFPlgn.dll@0xc6fe
19 coFFPlgn.dll coFFPlgn.dll@0x2a908
20 coFFPlgn.dll coFFPlgn.dll@0xc8813
21 coFFPlgn.dll coFFPlgn.dll@0xa9e51
22 coFFPlgn.dll coFFPlgn.dll@0x2a346
23 coFFPlgn.dll coFFPlgn.dll@0xaa35b
24 xul.dll nsObserverService::NotifyObservers xpcom/ds/nsObserverService.cpp:149
25 xul.dll nsCOMPtr_base::assign_from_qi obj-firefox/xpcom/build/nsCOMPtr.cpp:56
26 xul.dll xul.dll@0xebfe67
27 @0x12c713
28 xul.dll nsWindowWatcher::RemoveWindow embedding/components/windowwatcher/src/nsWindowWatcher.cpp:1221
29 xul.dll nsAppShellService::UnregisterTopLevelWindow xpfe/appshell/src/nsAppShellService.cpp:525
30 xul.dll nsTimerImpl::Release xpcom/threads/nsTimerImpl.cpp:138
31 xul.dll nsWebShellWindow::Destroy xpfe/appshell/src/nsWebShellWindow.cpp:758
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