Examine source code of EmojiBoard

{
  "manifest_version": 2,
  "name": "EmojiBoard",
  "version": "1.0",
  "description": "Emojis For v3rmillion.net, Credit to VeteranBlue",
  "icons": {
    "48": "icons/syntax.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://v3rmillion.net/newreply.php?tid=*"
      ],
      "js": [
        "source.js"
      ]
    }
  ]
}