Examine source code of Tildes ReExtended

{
  "manifest_version": 2,
  "name": "Tildes ReExtended",
  "description": "The principal enhancement suite for Tildes.",
  "version": "2.6.0",
  "permissions": [
    "downloads",
    "storage",
    "*://tildes.net/*"
  ],
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "css": [
        "css/content-scripts.css"
      ],
      "js": [
        "content-scripts/setup.js"
      ],
      "matches": [
        "https://*.tildes.net/*"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background/setup.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "128": "tildes-reextended.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a6a9b87-5ea1-441c-98d8-e27a1a0958c8}",
      "strict_min_version": "102.0"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; style-src 'unsafe-inline'"
}