Examine source code of PeshTools

{
  "manifest_version": 2,
  "name": "PeshTools",
  "short_name": "PeshTools",
  "description": "Полезные инструменты для сайта Peshkariki.ru",
  "version": "0.8.0.14resigned1",
  "version_name": "0.8-dev, build 13",
  "homepage_url": "https://peshtools.ganzal.com",
  "author": "Sergey D. Ivanov <me@ganzal.pro>",
  "content_scripts": [
    {
      "matches": [
        "https://peshkariki.ru/order/*"
      ],
      "css": [
        "/css/peshtools.embedded.css"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "contextMenus",
    "notifications",
    "webNavigation",
    "https://peshkariki.ru/order/*"
  ],
  "browser_action": {
    "default_icon": "/img/peshtools.png",
    "default_popup": "/html/peshtools.popup.html"
  },
  "background": {
    "page": "/html/peshtools.background.html",
    "persistent": true
  },
  "web_accessible_resources": [
    "/css/peshtools.embedded.css",
    "/img/*"
  ],
  "options_page": "/html/peshtools.options.html",
  "icons": {
    "48": "img/peshtools.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ef6b542-06f8-4697-a640-b2e77fc28476}"
    }
  }
}