Examine source code of Web Monitor

{
  "manifest_version": 2,
  "name": "eco-mon",
  "version": "1.3resigned1",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "input.js"
    ]
  },
  "permissions": [
    "tabs",
    "theme"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1953750d-c148-4d74-ac31-5a076719e5a5}"
    }
  }
}