Marker

With this extension you can Draw and Highlight on any Website. It saves your drawings on your Browser privately and lets you modify the Pen, like changing the Opacity and Size, or Erase and Save as Image.
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manifest.json
{
  "version": "1.5.2",
  "manifest_version": 2,
  "name": "Marker",
  "offline_enabled": true,
  "short_name": "marker-ink",
  "background": {
    "scripts": [
      "lib/background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "web_accessible_resources": [
    "data/interface/index.html"
  ],
  "homepage_url": "https://marker.ink",
  "review_url": "https://docs.google.com/forms/d/e/1FAIpQLSdndkyCQGsJuWDynrbzpNtBZYvC4IFX6-VvzcF8F3FnulGJeQ/viewform?usp=sf_link",
  "description": "Easily draw on any website with simple drawing tools, then save the result.",
  "browser_action": {
    "default_title": "Marker",
    "default_icon": {
      "16": "data/icons/OFF/16.png",
      "32": "data/icons/OFF/32.png",
      "48": "data/icons/OFF/48.png",
      "64": "data/icons/OFF/64.png",
      "96": "data/icons/OFF/96.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "96": "data/icons/96.png",
    "128": "data/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{977658c5-6602-4e3d-b3a6-24f38453b885}"
    }
  }
}