Examine source code of Simpcity Gallery Viewer

{
  "manifest_version": 3,
  "name": "SimpCity Gallery Viewer",
  "description": "Full-screen gallery viewer for SimpCity forum threads",
  "version": "2.0.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "downloads"
  ],
  "host_permissions": [
    "*://*.turbo.cr/*",
    "*://*.goonbox.cr/*",
    "*://*.pixhost.to/*",
    "*://*.imgbox.com/*",
    "*://*.imx.to/*",
    "*://*.postimg.cc/*",
    "*://*.imgur.com/*",
    "*://*.imagebam.com/*",
    "*://*.ibb.co/*",
    "*://*.pixl.is/*",
    "*://*.catbox.moe/*"
  ],
  "action": {
    "default_title": "SimpCity Gallery Viewer"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "simpcity-gallery-viewer@extension",
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.cuckcapital.cr/*",
        "*://*.simpcity.cr/*",
        "*://*.simpcity.su/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content-scripts/content.css"
      ],
      "matches": [
        "*://*.cuckcapital.cr/*",
        "*://*.simpcity.cr/*",
        "*://*.simpcity.su/*"
      ]
    }
  ]
}