RedactIt

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "RedactIt",
  "description": "Allows for the creation of blackout poetry across the web",
  "icons": {
    "16": "images/redact16.png",
    "48": "images/redact48.png",
    "128": "images/redact128.png"
  },
  "version": "0.2",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "jquery-3.1.1.min.js",
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ]
}