The firefox binary in Tor Browser on OSX is not PIE

otool -hv says that the firefox binary from Tor Browser on OSX is not PIE:

$ otool -hv firefox 
firefox:
Mach header
      magic cputype cpusubtype  caps    filetype ncmds sizeofcmds      flags
MH_MAGIC_64  X86_64        ALL LIB64     EXECUTE    22       2752   NOUNDEFS DYLDLINK TWOLEVEL BINDS_TO_WEAK

While on the firefox binary from Mozilla, it says this:

$ otool -hv /Volumes/Firefox/Firefox.app/Contents/MacOS/firefox
/Volumes/Firefox/Firefox.app/Contents/MacOS/firefox:
Mach header
      magic cputype cpusubtype  caps    filetype ncmds sizeofcmds      flags
MH_MAGIC_64  X86_64        ALL LIB64     EXECUTE    22       2744   NOUNDEFS DYLDLINK TWOLEVEL BINDS_TO_WEAK PIE

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