I was updating Firefox on my home machine from 1.5.0.8 to 2.0 and got the following window:
Notice the "(null)" highlighted in red. The installation went fine but it seems like somehow Firefox got confused between the version numbers. Actually my browser is configured for auto updates so 1.5.0.9 was downloaded and expected the browser to be restarted. But I downloaded 2.0 and installed that instead. So seems like Firefox lost track of version numbers in that process.
I can use the browser fine on my machine without any problem though.
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