Examine source code of FoxAge5ch

{
  "manifest_version": 2,
  "name": "FoxAge5ch",
  "version": "5.6",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "default_locale": "ja",
  "applications": {
    "gecko": {
      "id": "foxage2ch@xuldev.org",
      "strict_min_version": "100.0"
    }
  },
  "background": {
    "scripts": [
      "lib/browser-polyfill.js",
      "background/service.js",
      "background/utils.js"
    ]
  },
  "browser_action": {
    "default_title": "FoxAge5ch",
    "default_icon": "icons/icon-16.png",
    "theme_icons": [
      {
        "light": "icons/icon-light-16.png",
        "dark": "icons/icon-16.png",
        "size": 16
      },
      {
        "light": "icons/icon-light-32.png",
        "dark": "icons/icon-32.png",
        "size": 32
      }
    ]
  },
  "sidebar_action": {
    "browser_style": true,
    "default_title": "FoxAge5ch",
    "default_panel": "sidebar/view.html#sidebar",
    "default_icon": "icons/icon-16.png"
  },
  "options_ui": {
    "page": "sidebar/options.html",
    "open_in_tab": false
  },
  "permissions": [
    "storage",
    "tabs",
    "downloads",
    "*://*.2ch.net/*",
    "*://*.5ch.net/*",
    "*://machi.to/*",
    "*://*.machi.to/*",
    "*://*.bbspink.com/*",
    "*://*.open2ch.net/*",
    "*://*.vip2ch.com/*",
    "*://*.shitaraba.net/*"
  ]
}