Examine source code of HN Special - An addition to Hacker News

{
  "manifest_version": 2,
  "name": "HN Special - An addition to Hacker News",
  "description": "This extension refreshes the visual style of Hacker News and adds a few features. Everything is toggleable.",
  "version": "1.4.12",
  "homepage_url": "http://gabrielecirulli.github.io/hn-special/",
  "permissions": [
    "*://news.ycombinator.com/*"
  ],
  "optional_permissions": [
    "history"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b20d9da1-d0d0-4eba-a3e0-c1092b779858}",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "lib/extras/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "js": [
        "lib/tools/hide_flash.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "js": [
        "lib/tools/utility.js",
        "lib/settings.js",
        "lib/modules/visual_theme.js",
        "lib/modules/dark_theme.js",
        "lib/modules/high_contrast.js",
        "lib/modules/gray_visited_links.js",
        "lib/modules/open_links_in_new_tabs.js",
        "lib/modules/highlight_links_when_returning.js",
        "lib/modules/accurate_domain_names.js",
        "lib/modules/mark_as_read.js",
        "lib/modules/sticky_header.js",
        "lib/modules/hide_downvote.js"
      ],
      "css": [
        "lib/extras/hn_theme_base.css"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "lib/defaults.json",
    "lib/extras/permissions.html",
    "lib/extras/permissions.js",
    "lib/extras/hn_theme_base.css",
    "lib/extras/hn_theme_light.css",
    "lib/extras/hn_theme_light_contrast.css",
    "lib/extras/hn_theme_dark.css",
    "resources/gear.svg",
    "resources/arrow-up-white.svg",
    "resources/arrow-down-white.svg",
    "resources/arrow-up-black.svg",
    "resources/arrow-down-black.svg",
    "resources/logo.svg"
  ],
  "icons": {
    "16": "promo/icons/icon16.png",
    "32": "promo/icons/icon32.png",
    "48": "promo/icons/icon48.png",
    "64": "promo/icons/icon64.png",
    "128": "promo/icons/icon128.png"
  }
}