Examine source code of Scripts runner

{
  "manifest_version": 2,
  "name": "Scripts runner",
  "version": "1.0",
  "description": "A Firefox extension to create/run/edit small scripts. Created to improve the Bookmarklet feature, specifically to allow quick editing and testing. It also supports running the scripts inside iframes (bookmarklets don't).",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "clipboardRead",
    "webNavigation"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32.png"
    },
    "default_title": "Scripts",
    "default_popup": "popup/main.html"
  },
  "applications": {
    "gecko": {
      "id": "correo--correo@hotmail.com"
    }
  }
}