Examine source code of Epubkit Connect

{
  "icons": {
    "16": "icon16.plasmo.e7bcd3ac.png",
    "32": "icon32.plasmo.ce39377b.png",
    "48": "icon48.plasmo.3c17e113.png",
    "64": "icon64.plasmo.df317abe.png",
    "128": "icon128.plasmo.6a4310c5.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icon16.plasmo.e7bcd3ac.png",
      "32": "icon32.plasmo.ce39377b.png",
      "48": "icon48.plasmo.3c17e113.png",
      "64": "icon64.plasmo.df317abe.png",
      "128": "icon128.plasmo.6a4310c5.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.0.2",
  "author": "Randy Lu",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "activeTab",
    "scripting",
    "http://localhost/*"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{04cfc89a-d58b-4360-ad41-03d82c0c2b46}"
    }
  }
}