Examine source code of Image Blocker Pro

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon19-disabled.png"
    },
    "default_title": "Image Blocker Pro"
  },
  "description": "Image Blocker Pro",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 2,
  "name": "Image Blocker Pro",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "version": "1.2"
}