Examine source code of XCancelRedirect

{
  "manifest_version": 2,
  "name": "XCancelRedirect",
  "version": "1.2",
  "icons": {
    "48": "icons/border-48.png"
  },
  "description": "Automatically Redirects x.com to xcancel.com",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "strict_min_version": "58.0",
      "id": "{99f59414-6b9c-4ba2-8706-4b018bc10bdc}"
    },
    "host_permissions": [
      "https://x.com/*"
    ]
  }
}