Examine source code of LoLMath Extension

{
  "manifest_version": 2,
  "version": "1.0.2",
  "name": "LoLMath Extension",
  "description": "Allow LoL Game Data to be read by LoL Math",
  "permissions": [
    "*://*.lolmath.net/*",
    "*://localhost/*",
    "webRequest",
    "webRequestBlocking"
  ],
  "icons": {
    "16": "data/icons/16.png",
    "19": "data/icons/19.png",
    "32": "data/icons/32.png",
    "38": "data/icons/38.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  },
  "homepage_url": "https://lolmath.net",
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}