Examine source code of GetBlur.io

{
  "name": "GetBlur.io",
  "version": "1.3.0",
  "manifest_version": 2,
  "description": "Secure your sensitive info by blurring and hiding any element text, image, input or paragraphs with single click.",
  "homepage_url": "https://getblur.io",
  "icons": {
    "16": "/images/BlurLogo16.png",
    "32": "/images/BlurLogo32.png",
    "48": "/images/BlurLogo48.png",
    "128": "/images/BlurLogo128.png"
  },
  "background": {
    "scripts": [
      "/js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "/images/BlurLogo16.png",
    "default_title": "GetBlur.io"
  },
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "js": [
        "/js/content.js"
      ],
      "matches": [
        "<all_urls>",
        "*://*.mozilla.org/*"
      ],
      "exclude_matches": [
        "https://3.basecamp.com/*"
      ]
    }
  ]
}