Examine source code of Blacklist Skipper

{
  "manifest_version": 2,
  "name": "Blacklist Skipper",
  "version": "1.0",
  "description": "Skips blacklisted posts when using the next button on e621.net.",
  "icons": {
    "48": "icons/eternity.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.e621.net/posts/*/show_seq*"
      ],
      "js": [
        "blacklistskipper.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{db3491b4-9f55-4cbb-9000-e3e9c9d4291d}"
    }
  }
}