Crash while doing validation.

[maning]

This the mozilla crash report (also reported to Mozilla)

AdapterDeviceID: 0x6720
AdapterVendorID: 0x1002
Add-ons: maps%40ovi.com:5.2.7.0,wmsinspector%40flentic.net:0.2.1,yslow%40yahoo-inc.com:3.1.8,%7B2fa4ed95-0317-4c6a-a74c-5f3e3912c1f9%7D:2.3.1,%7B398e77b8-2304-11dc-8314-0800200c9a66%7D:0.3.17,%7Baff87fa2-a58e-4edd-b852-0a20203c1e17%7D:0.9,%7Be968fc70-8f95-4ab9-9e79-304de2a71ee1%7D:0.7.3,fontfinder%40bendodson.com:1.1.0,%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:29.0.1,%7Bc0c9a2c7-2e5c-4447-bc53-97718bc91e1b%7D:7.0,r2d2b2g%40mozilla.org:4.0.1,firebug%40software.joehewitt.com:1.12.8
BuildID: 20140506152807
CrashTime: 1401766686
EMCheckCompatibility: true
FramePoisonBase: 7ffffffff0dea000
FramePoisonSize: 4096
InstallTime: 1399943448
Notes: AdapterVendorID: 0x1002, AdapterDeviceID: 0x6720GL Layers! GL Context? GL Context+ GL Layers+ 
ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 854
StartupTime: 1401765835
Theme: classic/1.0
Throttleable: 1
URL: http://tasks.hotosm.org/job/331#
Vendor: Mozilla
Version: 29.0.1
useragent_locale: en-US

P.S. I know tasking manager 2 is the focus of the current development, but just pointing this out for provenance.