Examine source code of Draw on Page

{
  "version": "0.1.7",
  "manifest_version": 3,
  "name": "Draw on Page",
  "homepage_url": "https://mybrowseraddon.com/draw-on-page.html",
  "description": "Easily draw on any website with simple drawing tools, then print the result.",
  "commands": {
    "_execute_action": {}
  },
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "data/interface/index.html"
      ]
    }
  ],
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "109.0",
      "id": "{4ce83447-8255-43c2-b8f7-e02eb8c2cc39}"
    }
  },
  "background": {
    "scripts": [
      "lib/config.js",
      "lib/chrome.js",
      "lib/runtime.js",
      "lib/common.js"
    ]
  },
  "action": {
    "default_title": "Draw on Page",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  }
}