Examine source code of 307 Redirect Pro

{
  "manifest_version": 2,
  "name": "307 Redirect Pro",
  "version": "1.2.0",
  "author": "mike gieson",
  "description": "Redirect any source url to a different url (local or remote). Simple, popup interface.",
  "icons": {
    "16": "images/icons/icon-16.png",
    "19": "images/icons/icon-19.png",
    "32": "images/icons/icon-32.png",
    "48": "images/icons/icon-48.png",
    "64": "images/icons/icon-64.png",
    "128": "images/icons/icon-128.png",
    "512": "images/icons/icon-512.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icons/icon-16.png",
      "19": "images/icons/icon-19.png",
      "32": "images/icons/icon-32.png",
      "48": "images/icons/icon-48.png",
      "64": "images/icons/icon-64.png",
      "128": "images/icons/icon-128.png",
      "512": "images/icons/icon-512.png"
    },
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dcac3095-3bfd-4e51-96ea-1dcf007480a8}"
    }
  }
}