Examine source code of Substly Extension

{
  "name": "Substly Extension",
  "description": "Substly helps your company manage subscriptions to digital services.",
  "version": "1.2.2",
  "manifest_version": 3,
  "permissions": [
    "alarms",
    "storage",
    "webNavigation",
    "identity",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "subext@substly.com",
      "strict_min_version": "128.0"
    }
  },
  "icons": {
    "16": "logo-16x16-transparent.png",
    "32": "logo-32x32-transparent.png",
    "48": "logo-48x48-transparent.png",
    "64": "logo-64x64-transparent.png",
    "128": "logo-128x128-transparent.png"
  },
  "action": {
    "default_icon": {
      "16": "logo-16x16-gray-transparent.png",
      "32": "logo-32x32-gray-transparent.png"
    },
    "default_title": "Substly extension",
    "default_popup": "subex_popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "dialog.html",
        "dialogs/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ]
}