Examine source code of Modern Tab Switcher

{
  "manifest_version": 2,
  "name": "Modern Tab Switcher",
  "version": "0.2.0",
  "description": "Quickly search and jump to tabs (Chrome-like Ctrl+Shift+A).",
  "permissions": [
    "tabs",
    "sessions",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "favicon-16x16.png",
    "32": "favicon-32x32.png",
    "192": "android-chrome-192x192.png"
  },
  "browser_action": {
    "default_title": "Modern Tab Switcher",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "favicon-16x16.png",
      "32": "favicon-32x32.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Space"
      },
      "description": "Open Modern Tab Switcher"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "modern-tab-swithcer@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}