Examine source code of Only Images Dmtr.org

{
  "manifest_version": 2,
  "name": "Only Images Dmtr.org",
  "version": "0.2resigned1",
  "description": "Removes anything from a webpage except images.",
  "icons": {
    "48": "icons/onlyimages.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "hidetext.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4db32fc3-d058-4543-a924-94cf8fb4a514}"
    }
  }
}