Examine source code of COLORVISION

{
  "manifest_version": 2,
  "name": "COLOR_VISION",
  "version": "1.0.3",
  "description": "this help visually impaired one's to get better color perception",
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*",
        "<all_urls>"
      ],
      "js": [
        "cv/cv.js",
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "icons/logo.png",
    "default_popup": "popup.html",
    "default_title": "ColorVision"
  },
  "icons": {
    "16": "icons/logo.png",
    "128": "icons/logo.png"
  },
  "permissions": [
    "https://ajax.googleapis.com/"
  ],
  "web_accessible_resources": [
    "cv/cv.svg",
    "cv/cv-inject.css"
  ]
}