Examine source code of Incognito/Normal

{
  "manifest_version": 2,
  "name": "Incognito/Normal",
  "description": "Quickly switch current tab, link or search text to Google from incognito window to normal window, or vice versa.",
  "version": "1.2.1resigned1",
  "browser_action": {},
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "icons": {
    "16": "icon/16.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "applications": {
    "gecko": {
      "id": "@incognitonormal",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}