Examine source code of PixivDetector

{
  "manifest_version": 2,
  "name": "PixivDetector",
  "version": "0.17",
  "description": "Tool for detect pixiv member url in page",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "src/browser.js",
      "src/pageAction.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/browser.js",
        "src/content.js"
      ]
    }
  ],
  "page_action": {
    "default_icon": "data/pixiv-32.png"
  },
  "applications": {
    "gecko": {
      "id": "@pixivdetector"
    }
  }
}