Examine source code of Better Trading for Firefox

{
  "manifest_version": 3,
  "name": "Better Trading for Firefox",
  "description": "Bookmark trade searches, track history, and apply live enhancers on the Path of Exile trade site. Firefox-only MV3 extension.",
  "version": "1.1.0",
  "icons": {
    "16": "icon/16.png",
    "24": "icon/24.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "64": "icon/64.png",
    "96": "icon/96.png",
    "128": "icon/128.png",
    "256": "icon/256.png"
  },
  "homepage_url": "https://github.com/appaKappaK/better-trading-for-firefox",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://pathofexile.com/trade*",
    "*://www.pathofexile.com/trade*",
    "*://pathofexile.com/trade2*",
    "*://www.pathofexile.com/trade2*",
    "https://poe.ninja/*"
  ],
  "action": {
    "default_title": "Better Trade for FF",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7396a824-2f77-4f7e-a84c-f0b0ae80cfdc}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://pathofexile.com/trade*",
        "*://pathofexile.com/trade2*",
        "*://www.pathofexile.com/trade*",
        "*://www.pathofexile.com/trade2*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content-scripts/content.css"
      ],
      "matches": [
        "*://pathofexile.com/*",
        "*://pathofexile.com/*",
        "*://www.pathofexile.com/*",
        "*://www.pathofexile.com/*"
      ]
    }
  ]
}