Examine source code of MemoInjo

{
  "name": "MemoInjo",
  "description": "Stick memo on any website and sync via Joplin",
  "version": "0.1.3",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "activeTab"
  ],
  "options_ui": {
    "page": "memoinjo/options.html",
    "browser_style": false
  },
  "browser_action": {
    "default_icon": "memoinjo/icon128.png",
    "default_popup": "memoinjo/popup.html",
    "default_title": "Stick memo"
  },
  "icons": {
    "128": "memoinjo/icon128.png"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "windows": "Alt+Shift+M",
        "mac": "Ctrl+Shift+M",
        "chromeos": "Alt+Shift+M",
        "linux": "Alt+Shift+M"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "memoinjo@firefox",
      "strict_min_version": "42.0"
    }
  }
}