Examine source code of BGIPEO for Firefox

{
  "manifest_version": 2,
  "name": "BGIPEO for Firefox",
  "short_name": "BGIPEO",
  "version": "2.2.12",
  "description": "This is BGIPEO for Firefox Web Extensions",
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "57.0"
    }
  },
  "sidebar_action": {
    "default_icon": "icons/icon_16.png",
    "default_title": "BGIPEO",
    "default_panel": "ui/main.html"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon_16.png",
    "default_title": "BGIPEO for Firefox Web Extensions"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "homepage_url": "http://bgipeo.com",
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  }
}