Examine source code of Chess Instead of Posts

{
  "name": "Chess Instead of Posts",
  "description": "Blocks social media feed and shows daily chess puzzles instead.",
  "version": "1.0",
  "manifest_version": 2,
  "icons": {
    "128": "static/images/icons/icon-128x128.png",
    "144": "static/images/icons/icon-144x144.png",
    "152": "static/images/icons/icon-152x152.png",
    "192": "static/images/icons/icon-192x192.png",
    "256": "static/images/icons/icon-256x256.png",
    "384": "static/images/icons/icon-384x384.png",
    "512": "static/images/icons/icon-512x512.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "static/images/icons/icon-48x48.png",
      "128": "static/images/icons/icon-128x128.png",
      "192": "static/images/icons/icon-192x192.png"
    }
  },
  "content_scripts": [
    {
      "css": [
        "styles/hide.css"
      ],
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "utils/constants.js",
        "utils/helpers.js",
        "libs/jquery-3.5.1.min.js",
        "libs/chess.js",
        "libs/chessboard-1.0.0.js",
        "libs/glicko2.js",
        "scripts/content.js",
        "scripts/generatePuzzleAttemptData.js"
      ],
      "css": [
        "libs/chessboard-1.0.0.css",
        "styles/main.css",
        "styles/components/buttons.css",
        "styles/components/rating-card.css",
        "styles/components/completion.css",
        "styles/components/board-overrides.css",
        "styles/components/zen-mode.css",
        "styles/components/modal.css"
      ],
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "libs/*",
    "static/*",
    "templates/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b05de888-14ea-4b4f-bb15-b6ea31f620ad}"
    }
  }
}