Examine source code of Marktvaas

{
  "manifest_version": 2,
  "name": "Marktvaas",
  "version": "1.5.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "marktvaas@marktvaas.nonexisting"
    }
  },
  "description": "Enhanced features for marktplaats.nl",
  "icons": {
    "48": "icons/logo_48.png",
    "96": "icons/logo_96.png"
  },
  "browser_action": {
    "default_icon": "icons/logo_32.png",
    "default_title": "Marktvaas",
    "default_popup": "popup/settings.html"
  },
  "options_ui": {
    "page": "popup/settings.html"
  },
  "permissions": [
    "storage",
    "menus",
    "webRequest",
    "webRequestBlocking",
    "https://www.marktplaats.nl/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.marktplaats.nl/v/*"
      ],
      "js": [
        "libs/css.js",
        "libs/get_elem.js",
        "ad_page.js"
      ]
    },
    {
      "matches": [
        "https://www.marktplaats.nl/q/*",
        "https://www.marktplaats.nl/l/*"
      ],
      "js": [
        "libs/css.js",
        "libs/get_elem.js",
        "ad_list.js"
      ]
    },
    {
      "matches": [
        "https://www.marktplaats.nl/notifications*"
      ],
      "js": [
        "libs/css.js",
        "notifications.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js",
      "url_rewrite.js",
      "background_blockusers.js"
    ]
  }
}