Examine source code of KurumiEverywhere

{
  "manifest_version": 2,
  "name": "KurumiEverywhere",
  "version": "1.1resigned1",
  "description": "Replaces all images in every websites to kawaii images of Tokisaki Kurumi.",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "web_accessible_resources": [
    "images/*.jpg"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "kurumi.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": "icons/icon.png",
    "default_title": "Kurumi chan",
    "default_popup": "popup/kurumi.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2cc30a47-da5f-4fc1-91d3-e29ffa96b7d5}"
    }
  }
}