Examine source code of Redirect Manager

{
  "manifest_version": 2,
  "name": "Redirect Manager",
  "version": "1.3",
  "description": "Manage and enforce custom URL redirects in your browser.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_title": "Redirect Manager",
    "default_popup": "options.html"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{88f9a32a-5150-4c38-b48e-6171c60d0259}"
    }
  }
}