Examine source code of Hejt_ALERT

{
  "manifest_version": 2,
  "name": "Hejt_ALERT",
  "description": "",
  "version": "1.0.5resigned1",
  "browser_action": {
    "default_icon": "assets/stop48.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "tabs"
  ],
  "icons": {
    "16": "assets/stop16.png",
    "48": "assets/stop48.png",
    "128": "assets/stop128.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d55f73d1-9634-4966-83e3-fbd589e1b8e0}"
    }
  }
}