firefox: copy *.dylibs on darwin (#395916)

        + lib.optionalString isDarwin ''

          cd "${appPath}"

          # These files have to be copied and not symlinked, otherwise tabs crash.

          # The omni.ja files have to be copied and not symlinked, otherwise tabs crash.

          # Maybe related to how omni.ja file is mmapped into memory. See:

          # https://github.com/mozilla/gecko-dev/blob/b1662b447f306e6554647914090d4b73ac8e1664/modules/libjar/nsZipArchive.cpp#L204

          for file in $(find . -type l -name "omni.ja"); do

          #

          # The *.dylib files are copied, otherwise some basic functionality, e.g. Crypto API, is broken.

          for file in $(find . -name "omni.ja" -o -name "*.dylib"); do

            rm "$file"

            cp "${browser}/${appPath}/$file" "$file"

          done