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manifest.json
{
  "manifest_version": 2,
  "name": "Mute New Tabs",
  "version": "1.1resigned1",
  "description": "Mutes opened new tabs",
  "icons": {
    "48": "icons/shut-up-48.png"
  },
  "background": {
    "scripts": [
      "shut-up.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f22b4fce-b0b3-41a0-a0a3-3977cecb245a}"
    }
  }
}