Examine source code of My Tab Notes

{
  "manifest_version": 2,
  "name": "My Tab Notes",
  "version": "6.5",
  "description": "With this add-on, you can add notes to any tab you want.",
  "homepage_url": "http://www.inframe.ro",
  "browser_specific_settings": {
    "gecko": {
      "id": "mytabnotes@inframe.ro",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "assets/logo_32.png",
    "48": "assets/logo_48.png",
    "64": "assets/logo_64.png",
    "128": "assets/logo_128.png"
  },
  "browser_action": {
    "default_icon": "assets/logo_32.png",
    "default_title": "My Tab Notes"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/badge.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "assets/background.jpg",
    "assets/background2.jpg"
  ]
}