Examine source code of LyricSearch

{
  "manifest_version": 2,
  "name": "LyricSearch",
  "description": "Search for lyrics using Genius",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/lyricsearch-48.png"
  },
  "permissions": [
    "contextMenus"
  ]
}