Examine source code of kTab Manager

{
  "manifest_version": 2,
  "name": "kTab Manager",
  "version": "1.2",
  "description": "Keyboard-first tab manager. Instantly search, navigate and switch between all your open tabs, grouped by domain or window. Open with Option+T, type to search, arrow to navigate, Enter to select",
  "homepage_url": "https://github.com/jeromesaiz/ktab_manager",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "kTab Manager",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "mac": "Alt+T",
        "default": "Alt+Shift+T"
      },
      "description": "Open kTab Manager"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ktab-manager@jeromesaiz",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}