Fix ZApp injection to override Firefox settings

com.thelonelyghost.fix-jamf-firefox.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
   <key>Label</key>
   <string>com.thelonelyghost.fix-jamf-firefox</string>
   <key>ProgramArguments</key>
   <array>
      <string>/bin/zsh</string>
      <string>-c</string>
      <string>[ ! -e "/Applications/Firefox.app/Contents/Resources/defaults/pref/a1zscaler.js" ] || /usr/bin/sed -i '' -e 's!^pref(!//pref(!g' /Applications/Firefox.app/Contents/Resources/defaults/pref/a1zscaler.js</string>
   </array>
   <key>RunAtLoad</key>
   <true/>
   <key>StartInterval</key>
   <integer>900</integer>
</dict>
</plist>