Examine source code of Web Defuser

{
  "manifest_version": 2,
  "name": "Web Defuser",
  "version": "1.1.0",
  "description": "Userscripts/styles on steroids. Keep YouTube or Instagram playing in the background, remove annoying nagging popups, add dark mode to websites, increase video volume past 100% and more!",
  "icons": {
    "512": "./dist/icon.svg"
  },
  "browser_action": {
    "default_icon": {
      "512": "./dist/icon.svg"
    }
  },
  "background": {
    "scripts": [
      "./dist/background.js"
    ],
    "type": "module",
    "persistent": true
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "./dist/pages/options.html"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs",
    "scripting",
    "webRequest",
    "webRequestBlocking"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'",
  "browser_specific_settings": {
    "gecko": {
      "id": "web-defuser@gear54.me"
    },
    "gecko_android": {}
  }
}