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When I open FireFox it crashes about 5 seconds later, and this is the error:

BuildID: 20121129151842
CrashTime: 1355583809
EMCheckCompatibility: true
FramePoisonBase: 7ffffffff0dea000
FramePoisonSize: 4096
InstallTime: 1355581168
Notes: OpenGL: X.Org -- Gallium 0.4 on AMD RS780 -- 2.1 Mesa 9.0 -- texture_from_pixmap

ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 598
StartupTime: 1355583804
Theme: classic/1.0
Throttleable: 1
Vendor: Mozilla
Version: 17.0.1

This report also contains technical information about the state of the application when it crashed.
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Try opening Firefox in safe mode. This will disable the addons, so you'll be able to see whether the bug is in Firefox, or an add-on.

If it does not crash, try enabling your add-ons one by one, to find the one which is crashing Firefox.

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