Examine source code of Tab Priority Manager

{
  "manifest_version": 2,
  "name": "Tab Priority Manager",
  "version": "1.0",
  "description": "Set priority levels (high, medium, low) for tabs, sort them, and auto-close low-priority tabs to optimize browser performance.",
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "ui/popup.html",
    "default_title": "Tab Priority Manager"
  },
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7dd178ee-4a1e-4901-9531-0a44dae8c5c8}"
    }
  }
}