Examine source code of Post opener

{
  "name": "Post opener",
  "description": "This add-on is created for mass opening of images from posts. The add-on does not work on all sites.",
  "version": "0.1.6resigned1",
  "icons": {
    "512": "icons/icon.png"
  },
  "manifest_version": 2,
  "permissions": [
    "<all_urls>",
    "webNavigation",
    "tabs",
    "storage",
    "activeTab"
  ],
  "applications": {
    "gecko": {
      "id": "{8647ec0a-9e02-4dab-b82f-fb6cf9957fc1}"
    }
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_action": {
    "default_icon": {
      "512": "icons/icon.png"
    },
    "default_title": "Post opener",
    "default_popup": "popup/popup.html"
  }
}