Merlin
MPen

MPen

For example. To mark important sentence. To Write operations during Screencast. MPen is simple graffiti tool.

Merlin
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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "short_name": "__MSG_extName__",
  "version": "0.2.1",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "icons": {
    "128": "logo.png"
  },
  "browser_action": {
    "default_icon": "action.png",
    "default_title": "__MSG_extName__"
  },
  "offline_enabled": true,
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "web_accessible_resources": [],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'"
}