Firefox 18 fails to connect to any site beond Google. Same Network settings in Firefox 17 work.

After upgrading Firefox 17.x to version 18.0.1, the ONLY site that will connect and can run is Google.
Attempts to connect to any other DNS results in a tab displaying the label 'Connecting', with an hourglass circle. After rolling-back to Firefox 17.0esr, all connections succeed using the same proxy settings.

Here is the Troubleshooting Information from 18.0.1:
Application Basics
Name
Firefox
Version
18.0.1
User Agent
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Important Modified Preferences
Name
Value
browser.cache.disk.capacity
358400
browser.cache.disk.smart_size.first_run
false
browser.cache.disk.smart_size.use_old_max
false
browser.cache.disk.smart_size_cached_value
358400
browser.places.smartBookmarksVersion
4
browser.startup.homepage_override.buildID
20130116073211
browser.startup.homepage_override.mstone
18.0.1
extensions.lastAppVersion
18.0.1
network.cookie.prefsMigrated
true
places.database.lastMaintenance
1359418610
places.history.expiration.transient_current_max_pages
104858
privacy.sanitize.migrateFx3Prefs
true
Graphics
Adapter Description
NVIDIA GeForce 9300 GE
Adapter Drivers
nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM
256
Device ID
0x06e0
Direct2D Enabled
true
DirectWrite Enabled
true (6.1.7600.16972)
Driver Date
10-2-2012
Driver Version
9.18.13.697
GPU #2 Active
false
GPU Accelerated Windows
1/1 Direct3D 10
Vendor ID
0x10de
WebGL Renderer
Google Inc. -- ANGLE (NVIDIA GeForce 9300 GE)
AzureCanvasBackend
direct2d
AzureContentBackend
direct2d
AzureFallbackCanvasBackend
cairo
JavaScript
Incremental GC
true
Accessibility
Activated
false
Prevent Accessibility
0
Library Versions
Expected minimum version
Version in use
NSPR
4.9.4
4.9.4
NSS
3.14.1.0 Basic ECC
3.14.1.0 Basic ECC
NSSSMIME
3.14.1.0 Basic ECC
3.14.1.0 Basic ECC
NSSSSL
3.14.1.0 Basic ECC
3.14.1.0 Basic ECC
NSSUTIL
3.14.1.0
3.14.1.0

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