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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "ToggleTab",
  "description": "Toggles between the last two active tabs using a global hotkey.",
  "version": "1.0.1",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icon32.png"
  },
  "permissions": [
    "tabs",
    "commands"
  ],
  "options_page": "options.html",
  "background": {
    "scripts": [
      "scripts/eventpage.js"
    ],
    "persistent": true
  },
  "commands": {
    "toggle-feature-tabs": {
      "suggested_key": {
        "default": "Ctrl+Shift+1",
        "windows": "Ctrl+Shift+1",
        "mac": "Command+Shift+1",
        "chromeos": "Ctrl+Shift+1",
        "linux": "Ctrl+Shift+1"
      },
      "description": "Toggle between last two active tabs",
      "global": true
    }
  }
}