Examine source code of Mute Manager

{
  "manifest_version": 2,
  "version": "1.0.0",
  "name": "Mute Manager",
  "description": "Mute / Unmute tabs by default + whitelisted and blacklisted domains.",
  "browser_action": {
    "browser_style": true,
    "default_popup": "ui/pages/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "js": [
        "shared/all.js",
        "shared/c.js",
        "scripts/content/c1.js"
      ]
    }
  ],
  "background": {
    "persistent": true,
    "page": "scripts/background/bg.html"
  },
  "web_accessible_resources": [
    "ui/pages/options_tab.html"
  ],
  "permissions": [
    "<all_urls>",
    "tabs",
    "storage"
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.ico",
    "96": "icons/96.png",
    "128": "icons/128.png"
  }
}