Examine source code of Advanced Image Viewer

{
  "manifest_version": 2,
  "name": "__MSG_extension_title__",
  "version": "1.1",
  "description": "__MSG_extension_description__",
  "default_locale": "en",
  "icons": {
    "64": "icons/icon64.png",
    "128": "icons/icon128.png",
    "512": "icons/icon512.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "res/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7209f5d-fabf-4acd-98a0-7df8d066d7f1}"
    }
  }
}