Firefox crashes often

Question

Having updated to Firefox 10, we're getting frequent crashes. Seems to happen more on javascript-heavy and/or https sites. Having logged in tabs on gmail and facebook causes a crash every time.
Also happens in safe mode. Crash reporter does not appear.

Answer 1

I initially posted the about:support info from my usual profile rather than a clean profile. So, here's about:support from a clean profile:
Application Basics
Name
Firefox
Version
10.0
User Agent
Mozilla/5.0 (Windows NT 5.1; rv:10.0) Gecko/20100101 Firefox/10.0
Profile Directory
Open Containing Folder
Enabled Plugins
about:plugins
Build Configuration
about:buildconfig
Crash Reports
about:crashes
Memory Use
about:memory
Extensions
Name
Version
Enabled
ID
Java Quick Starter
1.0
false
[email protected]
Microsoft .NET Framework Assistant
0.0.0
false
{20a82645-c095-46ed-80e3-08825760534b}
Modified Preferences
Name
Value
browser.places.importBookmarksHTML
false
browser.places.smartBookmarksVersion
2
browser.startup.homepage_override.buildID
20120129021758
browser.startup.homepage_override.mstone
rv:10.0
extensions.lastAppVersion
10.0
network.cookie.prefsMigrated
true
places.history.expiration.transient_current_max_pages
25126
privacy.sanitize.migrateFx3Prefs
true
Graphics
Adapter Description
ATI Radeon X300/X550/X1050 Series
Vendor ID
1002
Device ID
5b62
Adapter RAM
Unknown
Adapter Drivers
ati2dvag
Driver Version
8.593.100.0
Driver Date
2-10-2010
Vendor ID (GPU #2)
1002
Device ID (GPU #2)
5b72
Adapter RAM (GPU #2)
Unknown
Adapter Drivers (GPU #2)
Unknown
Driver Version (GPU #2)
8.593.100.0
Driver Date (GPU #2)
2-10-2010
WebGL Renderer
Blocked for your graphics driver version. Try updating your graphics driver to version 10.6 or newer.
GPU Accelerated Windows
0/1. Blocked for your graphics driver version. Try updating your graphics driver to version 10.6 or newer.