Examine source code of Lurk

{
  "name": "Lurk",
  "version": "1.0.2resigned1",
  "description": "Removes distracting features from Twitter",
  "homepage_url": "https://github.com/Pr0x1m4/lurk",
  "manifest_version": 2,
  "minimum_chrome_version": "50",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "https://twitter.com/*"
  ],
  "applications": {
    "gecko": {
      "id": "twitterlurk@twitterlurk.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://twitter.com/*"
      ],
      "css": [
        "content.css",
        "dark-mode.css"
      ],
      "js": [
        "vendor/mousetrap.js",
        "vendor/mousetrap-global-bind.js",
        "vendor/element-ready.js",
        "vendor/scroll-to-tweet.js",
        "vendor/hide-promoted-tweets.js",
        "content.js"
      ]
    }
  ]
}