User Agent

Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.68 Safari/537.36 CrKey/1.44.191160

This user agent belongs to Chrome. Google Inc developed this Browser. This Browser run on Chromecast OS and it renders web contents with Blink on Chromecast.

Browser-Chrome

Chrome

Version 78.0 @ 64 bit
Developer Google Inc
Parent Chrome 78.0
Platform (64 bit) by Google Inc
Device Type TV Device

Act as 

Mobile No
Tablet No
Crawler No
Fake No
Anonymized No

Capabilities

 

Rendering Engine Blink by Google Inc (a WebKit Fork by Google)
Pointing -
Javascript Yes
CSS Yes Version: 3
Cookies Yes
Tables Yes

 

Frames Yes
IFrames Yes
Background Sounds No
Java Applets No
VB Script No
Activex No