Examine source code of Depopulate

{
  "name": "Depopulate. Depopulate your Images",
  "version": "0.0.10",
  "description": "An extension that blurs images containing skin tones or hues.",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "depopulate.js",
        "hover/hover.js",
        "hover/hover-site-specific.js",
        "document-engine.js",
        "image-calculator.js",
        "image-engine.js",
        "image-site-specific.js",
        "document-engine.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "options_ui": {
    "page": "/options/options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": "images/depop-logo128.png",
    "default_popup": "/popup/popup.html",
    "browser_style": true
  },
  "icons": {
    "16": "images/depop_pop-logo16.png",
    "32": "images/depop_pop-logo32.png",
    "128": "images/depop-logo128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8bb640b-7beb-4c6e-afd6-c282126767a0}"
    }
  }
}