Mute By Default

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Mute By Default",
  "description": "Mute tabs by default",
  "version": "0.1",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon.png"
    },
    "default_title": "Click to mute or unmute this website",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "options_page": "options.html",
  "manifest_version": 2
}