Firefox needs to be built with ASLR & FULL RELRO. The default hardened build specs went into effect on Feb 19th for rawhide. I don't know why the Firefox build tool is ignoring the hardened LD flags which enable pie and -z now.
Created attachment 1021520 [details] spec file patch See attached spec file patch which solves this.
Created attachment 1023934 [details] updated patch file for spec changes
Scratch Builds: F23: https://koji.fedoraproject.org/koji/taskinfo?taskID=9699011 F22: https://koji.fedoraproject.org/koji/taskinfo?taskID=9699025 F21: https://koji.fedoraproject.org/koji/taskinfo?taskID=9699029 F20: https://koji.fedoraproject.org/koji/taskinfo?taskID=9699033