Examine source code of Tone Fox

{
  "manifest_version": 2,
  "name": "Tone Fox",
  "version": "2.1.0",
  "icons": {
    "48": "icons/tone_fox.png"
  },
  "description": "Displays the meaning of tone indicators",
  "permissions": [
    "contextMenus",
    "notifications",
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "ToneIndicatorHoverTooltip.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "ToneIndicatorContextMenu.js"
    ]
  },
  "options_ui": {
    "page": "settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "toneFox@naomie.digital"
    }
  }
}