Examine source code of jLinks

{
  "manifest_version": 2,
  "name": "jLinks",
  "version": "1.1",
  "description": "stuff",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "background.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d6dc151-061e-43b7-96e5-4676e43fb530}"
    }
  }
}