Examine source code of Skip Proofpoint Redirect

{
  "manifest_version": 2,
  "name": "Skip Proofpoint Redirect",
  "version": "1.0.0",
  "description": "Skip Proofpoint URL Defense redirections",
  "background": {
    "scripts": [
      "background.bad63b9e.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://urldefense.com/v1/url?*",
    "https://urldefense.com/v2/url?*",
    "https://urldefense.com/v3/*",
    "https://urldefense.proofpoint.com/v1/url?*",
    "https://urldefense.proofpoint.com/v2/url?*",
    "https://urldefense.proofpoint.com/v3/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0009d18b-9c6d-48e3-a9c9-8fd694146c72}"
    }
  }
}