Examine source code of Github File Collapser

{
  "name": "Github File Collapser",
  "version": "0.1.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Collapses files that match supplied keywords in githubs file viewer for PR's. Customizable in options",
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}