Examine source code of Largest image

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "author": "mihkeltt",
  "version": "1.4resigned1",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icon_48.png"
  },
  "permissions": [
    "tabs",
    "menus"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icon_48.png"
    },
    "default_title": "__MSG_browserActionDefaultTitle__"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "commands": {
    "current-tab": {
      "suggested_key": {
        "default": "Ctrl+Comma"
      },
      "description": "Show image on the current tab."
    },
    "to-the-right": {
      "suggested_key": {
        "default": "Ctrl+Period"
      },
      "description": "Show image on the tabs to the right."
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bdef1bee-a5b7-4b3d-bab0-0be1286ba274}"
    }
  }
}