Examine source code of RGBlind

{
  "manifest_version": 2,
  "name": "RGBlind",
  "description": "Simulate color blindness in your web browser.",
  "version": "1.0.4resigned1",
  "homepage_url": "http://www.rgblind.se",
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*",
        "<all_urls>"
      ],
      "js": [
        "rgblind/rgblind.js",
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "icons/128.png",
    "default_popup": "popup.html",
    "default_title": "RGBlind - simulate color blindness."
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "https://ajax.googleapis.com/"
  ],
  "web_accessible_resources": [
    "rgblind/rgblind.svg",
    "rgblind/rgblind-inject.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c10f50fa-8025-49fc-8074-a4e66742686e}"
    }
  }
}