Examine source code of TurtleShell

{
  "name": "__MSG_appName__",
  "short_name": "__MSG_appName__",
  "version": "1.2.3",
  "manifest_version": 2,
  "author": "support@blackturtle.eu",
  "description": "__MSG_appDescription__",
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "windows": "Alt+Shift+K",
        "mac": "Alt+Shift+K",
        "chromeos": "Alt+Shift+K",
        "linux": "Alt+Shift+K"
      }
    }
  },
  "icons": {
    "16": "images/icon_16.png",
    "20": "images/icon_20.png",
    "24": "images/icon_24.png",
    "30": "images/icon_30.png",
    "42": "images/icon_42.png",
    "44": "images/icon_44.png",
    "50": "images/icon_50.png",
    "54": "images/icon_54.png",
    "70": "images/icon_70.png",
    "90": "images/icon_90.png",
    "120": "images/icon_120.png",
    "128": "images/icon_128.png",
    "150": "images/icon_150.png",
    "210": "images/icon_210.png",
    "270": "images/icon_270.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon_16.png",
      "20": "images/icon_20.png",
      "24": "images/icon_24.png",
      "30": "images/icon_30.png",
      "42": "images/icon_42.png",
      "44": "images/icon_44.png",
      "50": "images/icon_50.png",
      "54": "images/icon_54.png",
      "70": "images/icon_70.png",
      "90": "images/icon_90.png",
      "120": "images/icon_120.png",
      "128": "images/icon_128.png",
      "150": "images/icon_150.png",
      "210": "images/icon_210.png",
      "270": "images/icon_270.png"
    },
    "default_title": "TurtleShell",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "file://*/*",
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "contentscript.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "permissions": [
    "storage",
    "unlimitedStorage",
    "clipboardWrite",
    "idle",
    "activeTab",
    "webRequest",
    "notifications",
    "tabs"
  ],
  "web_accessible_resources": [
    "inpage.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{21dae71c-852e-4e14-b8c6-3d14e8953bc1}"
    }
  }
}