Examine source code of Reddit Shopping Tool

{
  "manifest_version": 2,
  "name": "Reddit Scammer Labeler",
  "short_name": "RSL",
  "description": "Automatically labels users based on the Universal Scammers List",
  "version": "1.5.3",
  "icons": {
    "16": "icon/icon16.png",
    "48": "icon/icon48.png",
    "128": "icon/icon128.png"
  },
  "permissions": [
    "storage",
    "https://*.reddit.com/*"
  ],
  "options_ui": {
    "page": "rst-options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.reddit.com/*"
      ],
      "exclude_matches": [
        "https://mod.reddit.com/*",
        "https://ads.reddit.com/*",
        "https://i.reddit.com/*",
        "https://static.reddit.com/*",
        "https://thumbs.reddit.com/*",
        "https://blog.reddit.com/*",
        "https://code.reddit.com/*",
        "https://about.reddit.com/*",
        "https://*.reddit.com/chat/*",
        "https://*.reddit.com/*.compact",
        "https://*.reddit.com/*.compact?*",
        "https://*.reddit.com/*.json",
        "https://*.reddit.com/*.json?*",
        "https://*.reddit.com/*.json-html",
        "https://*.reddit.com/*.json-html?*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "rst-script.js"
      ],
      "css": [
        "rst.css"
      ],
      "run_at": "document_idle"
    }
  ]
}