Examine source code of Beaujeu-ify

{
  "manifest_version": 2,
  "name": "Beaujeu-ify",
  "version": "0.2",
  "description": "Changes all occurences of `[Bb]illard` to `[Bb]eau jeu`",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "beaujeuify.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tac@fcbeauj.eu"
    }
  }
}