Examine source code of Session Pal

{
  "manifest_version": 3,
  "name": "Session Pal",
  "version": "1.1",
  "description": "A single-page session pal for saving and restoring browser sessions.",
  "permissions": [
    "tabs",
    "storage",
    "scripting"
  ],
  "optional_host_permissions": [
    "*://*.youtube.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "session-pal@session-pal-dev.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "logo_16x16.png",
    "32": "logo_32x32.png",
    "48": "logo_48x48.png",
    "64": "logo_64x64.png",
    "128": "logo_128x128.png",
    "256": "logo_256x256.png"
  },
  "action": {
    "default_title": "Open Session Pal",
    "default_icon": {
      "16": "logo_16x16.png",
      "32": "logo_32x32.png",
      "48": "logo_48x48.png",
      "128": "logo_128x128.png"
    }
  },
  "commands": {
    "open-session-pal": {
      "suggested_key": {
        "default": "Ctrl+Alt+B"
      },
      "description": "Open Session Pal"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}