Examine source code of addy.io - Protect Your Real Email With Aliases

{
  "manifest_version": 3,
  "name": "addy.io - Protect Your Email With Aliases",
  "short_name": "addy.io",
  "author": "Will Browning",
  "description": "addy.io is open-source and creates aliases that forward to your real inbox. Share an alias instead of your main email address.",
  "homepage_url": "https://addy.io",
  "version": "3.0.8",
  "icons": {
    "16": "img/icon_16.png",
    "32": "img/icon_32.png",
    "48": "img/icon_48.png",
    "96": "img/icon_96.png",
    "128": "img/icon_128.png"
  },
  "action": {
    "default_title": "addy.io",
    "default_popup": "app.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus",
    "notifications"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "create_and_copy_alias": {
      "suggested_key": {
        "default": "Alt+Shift+G"
      },
      "description": "Create and copy new addy.io alias"
    },
    "open_addy_extension": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      },
      "description": "Open addy.io extension"
    },
    "toggle_addy_sidebar": {
      "suggested_key": {
        "default": "Ctrl+Alt+S"
      },
      "description": "Toggle addy.io sidebar"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' ; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "browser-extension@anonaddy"
    }
  },
  "sidebar_action": {
    "default_icon": {
      "16": "img/icon_16.png",
      "32": "img/icon_32.png",
      "48": "img/icon_48.png",
      "96": "img/icon_96.png",
      "128": "img/icon_128.png"
    },
    "default_title": "addy.io",
    "default_panel": "app.html"
  }
}