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manifest.json

{
  "description": "Adds a select all e-mails button to old Gmail interface. See https://github.com/mmendescortes/select-all-emails-on-old-gmail-interface",
  "manifest_version": 2,
  "name": "Select all e-mails on old Gmail interface",
  "version": "1.1",
  "homepage_url": "https://github.com/mmendescortes/select-all-emails-on-old-gmail-interface",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/mail/*/h*"
      ],
      "js": [
        "extension.js"
      ]
    }
  ]
}