User Agents

Mozilla/5.0 (Linux; Android 10; LM-X520 Build/QKQ1.200531.002; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/300.2.0.58.129;]

This user agent string belongs to Facebook App browser running on Android OS. The browser is developed by Facebook and renders web pages using the Blink engine.

Browser
Name Facebook App
Architecture 32-bit
Developer Facebook
Rendering Engine Blink
Type Application
Platform
Name Android
Architecture 32-bit
Developer Google Inc
Device
Type Mobile Phone
Pointer touchscreen
Capabilities
ActiveX Controls No
Background Sounds No
Cookies Yes
Frames Yes
Iframes Yes
Java Applets No
JavaScript Yes
Tables Yes
VBScript No
Properties
RSS Reader No
Fake No
Crawler No
Anonymized No
Mobile Yes
Tablet No
Modified No
Beta Version No
Alpha Version No
CSS Support
CSS 1 Yes
CSS 2 Yes
CSS 3 Yes
CSS 4 No