Examine source code of Better Steam

{
  "manifest_version": 2,
  "name": "Better Steam",
  "description": "Makes Steam better by removing the bloat, adding game insights, and surfacing the best deals for you to explore.",
  "version": "1.0.0",
  "icons": {
    "16": "icon/16.png",
    "24": "icon/24.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Better Steam by Steambase",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://steamcommunity.com/*",
        "*://store.steampowered.com/*"
      ],
      "js": [
        "content-scripts/steam-global-bypass-age-check.js",
        "content-scripts/steam-global-bypass-link-filter.js",
        "content-scripts/steam-global-remove-header-install-button.js"
      ]
    },
    {
      "matches": [
        "*://store.steampowered.com/agecheck/app/*"
      ],
      "js": [
        "content-scripts/steam-store-app-agecheck-links.js"
      ]
    },
    {
      "matches": [
        "*://store.steampowered.com/app/*"
      ],
      "css": [
        "content-scripts/steam-store-app-player-stats.css"
      ],
      "js": [
        "content-scripts/steam-store-app-header-links.js",
        "content-scripts/steam-store-app-linkbar-links.js",
        "content-scripts/steam-store-app-player-score-label.js",
        "content-scripts/steam-store-app-player-stats.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2147b8b7-8946-4a47-b29c-09eb7ceed35a}"
    }
  }
}