User Agent

Mozilla/5.0 (iPad; CPU iPad OS 10_3_3 like Mac OS X) AppleWebKit/533.1 (KHTML, like Gecko) FxiOS/15.0t4091.0 Mobile/11J556 Safari/533.1

This user agent belongs to Firefox for iOS. Mozilla Foundation developed this Browser. This Browser run on iOS and it renders web contents with WebKit on iPad.

Browser - Firefox for iOS

Firefox for iOS

Version15.0 @ 32 bit
DeveloperMozilla Foundation
ParentFirefox 15.0 for iOS
Device TypeTablet

Act as 

Crawler No
Fake No
Anonymized No

Device - Apple

BrandApple
ModeliPad
Platform apple (32 bit) by Apple Inc
Mobile Yes
Tablet Yes

Capabilities

Rendering EngineWebKit by Apple Inc (For Google Chrome, iOS (including both mobile Safari, WebViews within third-party apps, and web clips), Safari, Arora, Midori, OmniWeb, Shiira, iCab since version 4, Web, SRWare Iron, Rekonq, and in Maxthon 3.)
Pointingtouchscreen
Javascript Yes
CSS Yes Version: 3
Cookies Yes
Tables Yes
Frames Yes
IFrames Yes
Background Sounds No
Java Applets Yes
VB Script No
Activex No