Examine source code of MediaExtractor

{
  "manifest_version": 2,
  "name": "MediaExtractor",
  "description": "Extract url from browser request with media file extension(s) to clipboard",
  "version": "1.2.0",
  "icons": {
    "24": "/assets/icon/icon-on.svg"
  },
  "background": {
    "scripts": [
      "/js/settings.js",
      "/js/util.js",
      "/js/main.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "/html/options.html",
    "default_icon": {
      "24": "/assets/icon/icon-on.svg"
    }
  },
  "options_ui": {
    "page": "/html/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "clipboardWrite"
  ],
  "applications": {
    "gecko": {
      "id": "mediaextractor@example.com"
    }
  }
}