Examine source code of FireRSS - RSS and Atom Feeds Scraper

{
  "manifest_version": 3,
  "name": "FireRSS - RSS and Atom Feeds Scraper",
  "short_name": "FireRSS",
  "description": "A RSS and Atom feeds scraper on the current page",
  "version": "2.3.2",
  "homepage_url": "https://github.com/mt190502/firerss",
  "icons": {
    "32": "img/firerss_32.png",
    "64": "img/firerss_64.png",
    "128": "img/firerss_128.png",
    "256": "img/firerss_256.png",
    "512": "img/firerss_512.png"
  },
  "action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "32": "img/firerss_32_gray.png",
      "64": "img/firerss_64_gray.png",
      "128": "img/firerss_128_gray.png",
      "256": "img/firerss_256_gray.png",
      "512": "img/firerss_512_gray.png"
    }
  },
  "background": {
    "scripts": [
      "js/background.js",
      "js/content.js"
    ]
  },
  "permissions": [
    "tabs",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firerss@mtaha.dev",
      "strict_min_version": "135.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "html/settings.html"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "img/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "resources": [
        "js/youtube.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    }
  ]
}