Examine source code of Selection Toolbar

{
  "manifest_version": 3,
  "name": "Selection Toolbar: Highlighter, Notes, AI",
  "description": "Highlight text on any page and find it again next visit. Select text for a toolbar to copy, search, translate, note, or ask an AI.",
  "version": "2.5.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "identity"
  ],
  "commands": {
    "toggle-note": {
      "suggested_key": {
        "default": "Alt+Shift+N"
      },
      "description": "Show or hide the scratch note"
    },
    "open-highlights": {
      "suggested_key": {
        "default": "Alt+Shift+H"
      },
      "description": "Open the highlights panel"
    },
    "open-settings": {
      "description": "Open Selection Toolbar settings"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "note.html",
        "chunks/*",
        "assets/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "resources": [
        "content-scripts/content.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "selection-toolbar@extensions.r44j.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction",
          "personallyIdentifyingInfo"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "Highlights"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": false,
      "run_at": "document_end",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}