Examine source code of Steam Sales Helper

{
  "manifest_version": 2,
  "name": "Steam Sales Helper",
  "version": "0.5.3",
  "author": "Maxim Maksovich",
  "homepage_url": "https://vk.com/maxim.maksovich",
  "description": "Помошник по Steam скидкам.",
  "icons": {
    "16": "data/icon/256.svg",
    "32": "data/icon/256.svg",
    "48": "data/icon/256.svg",
    "64": "data/icon/256.svg",
    "128": "data/icon/256.svg",
    "256": "data/icon/256.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@steam-sales-halper",
      "strict_min_version": "54.0"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "content_scripts": [
    {
      "matches": [
        "*://store.steampowered.com/search/*",
        "*://store.steampowered.com/app/*",
        "*://store.steampowered.com/wishlist/*",
        "*://store.steampowered.com/points/shop*",
        "*://steamcommunity.com/id/*",
        "*://steamcommunity.com/profiles/*"
      ],
      "js": [
        "data/js/purify.js",
        "data/js/arrive.js",
        "data/js/main.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://steamdb.info/app/*/?prices"
      ],
      "css": [
        "data/css/steamdb.css"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "data/js/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Steam Sales Helper",
    "default_popup": "popup.html",
    "browser_style": false,
    "default_icon": "data/icon/256.svg"
  },
  "permissions": [
    "*://store.steampowered.com/*",
    "*://steamcommunity.com/*",
    "*://help.steampowered.com/*",
    "*://steamdb.info/*",
    "storage"
  ]
}