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To install an extension you need to:

  1. Place the extracted extension directory into the chroot, such as /opt/firefox/extensions
  2. Ensure the extension is correctly named as its install.rdf id

    root@x220:/opt/firefox/extensions# grep '' kiosk\ em:id=""

You can verify this manually with something like:

for i in */; do grep -m 1 -H em:id "${i}install.rdf"; done