Hi-res cover art grabber

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Hi-res cover art grabber",
  "description": "Retrieves larger versions of cover art on various online stores, like App Store.",
  "manifest_version": 2,
  "version": "2.0.0",
  "page_action": {
    "default_icon": {
      "19": "icons/button-19.png",
      "38": "icons/button-38.png"
    },
    "default_title": "Get large version of cover"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "declarativeContent",
    "activeTab"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "js": [
        "includes/googlePlay.js"
      ],
      "matches": [
        "*://play.google.com/store/apps/*",
        "*://play.google.com/music/*"
      ]
    },
    {
      "js": [
        "includes/iTunes.js"
      ],
      "matches": [
        "*://itunes.apple.com/*/*"
      ]
    },
    {
      "js": [
        "includes/microsoft.js"
      ],
      "matches": [
        "https://www.microsoft.com/*/store/p/*"
      ]
    },
    {
      "js": [
        "includes/playstation.js"
      ],
      "matches": [
        "https://store.playstation.com/*"
      ]
    },
    {
      "js": [
        "includes/steam.js"
      ],
      "matches": [
        "*://store.steampowered.com/app/*"
      ]
    }
  ]
}