Examine source code of Sticky Notes for Tabs

{
  "manifest_version": 2,
  "name": "Sticky Notes",
  "description": "Notes for your browser",
  "version": "2.0.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "storage",
    "scripting",
    "offscreen",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "assets/sounds/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9f09875-0fd5-451a-a474-fd783c4fab3d}"
    }
  }
}