Examine source code of Leakuidator+

{
  "manifest_version": 2,
  "name": "Leakuidator+",
  "description": "Protect your identity on the web",
  "version": "0.0.0.6",
  "permissions": [
    "webNavigation",
    "webRequest",
    "background",
    "webRequestBlocking",
    "tabs",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "16": "./icons/icon.png",
    "48": "./icons/icon.png",
    "128": "./icons/icon.png"
  },
  "background": {
    "persistent": true,
    "page": "background.html"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{672bc418-04a2-430c-ae37-778a1da768b9}"
    }
  }
}