Examine source code of BulletsX

{
  "manifest_version": 2,
  "name": "BulletsX",
  "version": "1.2resigned1",
  "description": "use in www.douyu.com/* pages, to present a tidy page and 10 popup bullet comment",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.douyu.com/*"
      ],
      "js": [
        "content_scripts/beastify.js",
        "content_scripts/alien/jquery.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "apeXcode@163.com"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/bullets-32.png",
    "default_title": "BulletsX",
    "default_popup": "page/popup.html"
  }
}