Examine source code of AnnotationsLeBonCoin

{
  "manifest_version": 2,
  "name": "AnnotationsLeBonCoin",
  "version": "1.5",
  "description": "une extension pour masquer ou annoter des annonces sur LeBonCoin",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.leboncoin.fr/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "expert.min.js"
      ],
      "css": [
        "expert.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "annotationsleboncoin@asmidio.com",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "images/hide.png",
    "images/note.png"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}