Examine source code of CORS Unblock

{
  "manifest_version": 2,
  "version": "0.3.8",
  "name": "CORS Unblock",
  "description": "__MSG_description__",
  "default_locale": "en",
  "permissions": [
    "storage",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "declarativeNetRequest",
    "contextMenus"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "x-frame",
        "enabled": false,
        "path": "rulesets/x-frame.json"
      },
      {
        "id": "overwrite-origin",
        "enabled": false,
        "path": "rulesets/overwrite-origin.json"
      },
      {
        "id": "allow-credentials",
        "enabled": false,
        "path": "rulesets/allow-credentials.json"
      },
      {
        "id": "allow-headers",
        "enabled": false,
        "path": "rulesets/allow-headers.json"
      },
      {
        "id": "referer",
        "enabled": false,
        "path": "rulesets/referer.json"
      },
      {
        "id": "csp",
        "enabled": false,
        "path": "rulesets/csp.json"
      },
      {
        "id": "allow-shared-array-buffer",
        "enabled": false,
        "path": "rulesets/allow-shared-array-buffer.json"
      }
    ]
  },
  "icons": {
    "16": "/data/icons/16.png",
    "32": "/data/icons/32.png",
    "48": "/data/icons/48.png",
    "64": "/data/icons/64.png",
    "128": "/data/icons/128.png",
    "256": "/data/icons/256.png",
    "512": "/data/icons/512.png"
  },
  "homepage_url": "https://webextension.org/listing/access-control.html",
  "browser_action": {},
  "background": {
    "scripts": [
      "worker.js",
      "context.js",
      "v2.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8d9dd0f0-6dc5-4595-8c81-fab876d0fef0}"
    }
  }
}