Examine source code of Referer Modifier

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "author": "Fiona Klute",
  "version": "1.1.0",
  "homepage_url": "https://github.com/airtower-luna/referer-mod",
  "default_locale": "en",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_action": {
    "default_icon": "icon.svg",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "engine.js",
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "referer-mod@9a5ba22d-c08f-494f-86c2-e9fd04a6a42c",
      "strict_min_version": "90.0"
    }
  }
}