Why does Firefox complain that it can not find a compatible GRE between version 1.9b5 and 1.9b5?

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Release Found: Red Hat Enterprise Linux 5

Firefox may issue an error similar to the following:

Cannot find  a compatible GRE between version 1.9b5 and 1.9b5

This error can be resolved using steps provided below.

Find your Gecko Runtime Environment (GRE) version number by running this command:
...

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