Examine source code of http-response-filter

{
  "description": "Altering HTTP responses",
  "manifest_version": 2,
  "name": "http-response-filter",
  "version": "1.0",
  "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/http-response",
  "icons": {
    "48": "pen.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://example.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "{3d41d203-058b-4072-bd3e-6962dc8cef40}"
    }
  }
}