remove Firefox extension maxVersion

unmaxed.sh

#!/bin/bash

usage() {
  cat >&2 <<EOT
Usage: $(basename $0) <a_url_to_a_ff_ext.xpi>
EOT
  exit 1;
}

if [ "$#" -lt "1" ]; then
  usage;
fi

prevdir=$(pwd);
tmpdir=$(mktemp -d -t "$name-XXXX");

clean_up () {
  rm -rf "$tmpdir";
}

die_earlier () {
  [ ! -z "$1" ] && echo -e "$1" >&2;
  clean_up;
  exit 1;
}

trap die_earlier HUP INT TRAP;

url="$1";
filename=$(basename "$url");
unmaxed="${filename%.xpi}-unmaxed.xpi";

cd "$tmpdir";
curl -sO "$url";
unzip -q "$filename" -d unzipped || die_earlier "There were problems unzipping your file.\nAre you sure it's a Firefox extension?";
if [ -e unzipped/install.rdf ]; then
  echo 1 | sed -re 's/1//' &>/dev/null; # feature detect sed, lol
  if [ "$?" -eq "0" ]; then
    sed -i -r -e 's/maxVersion>[^>]+</maxVersion>\*</' unzipped/install.rdf;
  else
    sed -E 's/maxVersion>[^>]+</maxVersion>\*</' unzipped/install.rdf > stupid-os-x.txt;
    mv -f stupid-os-x.txt unzipped/install.rdf;
  fi
else
  die_earlier "Didn't find an install.rdf in that file.\nAre you sure it's a Firefox extension?";
fi
cd unzipped;
zip -q -r "$prevdir/$unmaxed" .;

echo "Drag and drop $prevdir/$unmaxed to Firefox to install";
clean_up;