Really Mute Inactive Tabs LT.

This extension mute inactive tabs

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Really Mute Inactive Tabs LT.",
  "description": "This extension mute inactive tabs",
  "version": "1.0",
  "browser_action": {
    "default_icon": "iconOn.png"
  },
  "background": {
    "scripts": [
      "eventPage.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs",
    "storage"
  ]
}