Examine source code of Toggle Elements

{
  "manifest_version": 2,
  "name": "Toggle Elements",
  "version": "1.0.2",
  "description": "Pick any element with the eyedropper to hide it, then bring everything back with one switch.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Toggle Elements",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "toggle-elements@fakehams.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}