Examine source code of Referer Remover

{
  "manifest_version": 2,
  "name": "Referer Remover",
  "version": "1.0",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8bc2d97f-a13b-444a-9b0f-eda5d82e39a9}"
    }
  }
}