Page Masker

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Page Masker",
  "description": "Masks out a section of the page.",
  "version": "2.0",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "page.js"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_title": "Masks out a section of the page."
  },
  "manifest_version": 2
}