cfx test -b /usr/lib/firefox-trunk/firefox-trunk -v
Using binary at '/usr/lib/firefox-trunk/firefox-trunk'.
Using profile at '/tmp/tmpAiFt5U.mozrunner'.
Running tests on Firefox-Trunk 31.0a1/Gecko 31.0a1 ({ec8030f7-c20a-464f-9b0e-13a3a9e97384}) under linux/x86.
console.info: jetpack-panelview: executing 'jetpack-panelview/tests/test-panelview.testConstruction'
console.info: jetpack-panelview: pass: undefined
console.error: jetpack-panelview:
  No known content item type defined (item: ({label:"invalid content item"}))
console.error: jetpack-panelview:
  warnings and/or errors were logged.

1 of 2 tests passed.

The following tests failed:

JavaScript strict warning: chrome://browser/content/urlbarBindings.xml, line 669: reference to undefined property this._value
JavaScript error: chrome://browser/content/urlbarBindings.xml, line 651: aUrl is undefined
Total time: 1.789153 seconds
Program terminated unsuccessfully.