Examine source code of 9to5 Reader

{
  "name": "9to5 Reader",
  "description": "A sidebar that show news from 9to5 sites",
  "homepage_url": "https://github.com/kidwm/9to5-reader",
  "manifest_version": 2,
  "permissions": [
    "https://9to5mac.com/*",
    "https://9to5google.com/*",
    "https://9to5linux.com/*",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "sidebar_action": {
    "default_title": "9to5 Reader",
    "default_panel": "sidebar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c873567a-7cd8-47ad-b2a9-e46ad7fcba45}"
    }
  },
  "version": "1.0.3"
}