Examine source code of Auction Skin Trade Helper

{
  "name": "Auction Skin Trade Helper",
  "version": "1.7.4",
  "description": "auction-skin.com",
  "manifest_version": 2,
  "icons": {
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.auction-skin.com/*"
      ],
      "all_frames": true,
      "js": [
        "fuckfirefox.js"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "*://*.auction-skin.com:*/*"
    ]
  },
  "browser_action": {
    "default_icon": "128.png",
    "default_popup": "popup.html",
    "icons": {
      "128": "128.png"
    }
  },
  "permissions": [
    "background",
    "webRequest",
    "webRequestBlocking",
    "*://steamcommunity.com/*",
    "*://*.steampowered.com/*",
    "storage"
  ]
}