Examine source code of Focusify

{
  "manifest_version": 3,
  "name": "Focusify",
  "version": "1.0",
  "description": "A browser extension to create a focus mode by hiding all tabs except the current one.",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "0047c74344f094cf8b0d83812a39ad29a19102@example.org",
      "strict_min_version": "42.0"
    }
  }
}