FmxLinux is a set of tools for Delphi developers, who can create UI applications for Linux with Embarcadero Delphi.
FmxLinux is available as free addon on GetIt Package Manager since June 2019. It supports only Delphi 10.3.1 and later. If you have a valid license of RAD Studio 10.3.1+ you can upgrade to FmxLinux Life-Time License just for $99 USD.
WebBrowser requires WebKitGtk, which is usually installed by default on every Linux. But, if doesn't, just install it first - "sudo apt install libwebkit2gtk-4.0" or "sudo yum install webkitgtk2.x86_64"
Here is a post in our blog about using FmxLinux without Desktop http://ksdev.blogspot.ru/2017/12/using-firemonkey-graphics-in-cgi-script.html