Examine source code of BadSubs

{
  "manifest_version": 2,
  "name": "BadSubs",
  "version": "0.1.0",
  "description": "Auto hides post from selected subreddits",
  "content_scripts": [
    {
      "matches": [
        "*://old.reddit.com/r/all*",
        "*://old.reddit.com/r/popular*"
      ],
      "js": [
        "script.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ]
}