Hi, You have multiple errors in your video card drivers : failures: [u'CP+[GFX1-]: Failed to allocate a surface due to invalid size (DTD) Size(18496,9600)'] being one that as listed as a failure but there are a bunch more not working properly. If you Copy/Paste about:support to the Address Bar then Enter you will be able to see yourself. u'unavailable is bad, u'available is good Need to uninstall and reinstall your video drivers or update them. As to how you do that on Linux that is your thing as I do not use it.

G'luck Please let us know if this solved your issue or if need further assistance.