Firefox: “Could not find compatible GRE”

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Question : Firefox: “Could not find compatible GRE” 

Answer : if you are behind ubuntu or debian , mint or other based debian distro .

try

sudo xulrunner-1.9 --register-global

will solve your issue, 

if you are behind redhat system ( centos-fedora-Suse-…..)

 remove firefox and xulrunner

reinstall the packages again and should work.