Firefox crashes reported on Ubuntu 12.04

From an email bug report:

Since my upgrade from Ubuntu 10.40 to 12.04 (fresh install) & the add-on has been crashing my FF very often until I discovered that when gradually disabling all add-ons.

The terminal errors I am getting are posted here: http://pastebin.com/U0YDiquS

Reported in 2.2.3 and 3.0.0

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