Not by default yet, but you can enable it for testing. Requires a recompile with a properties file to make the option appear.
>Experimental Servo support
>To compile with Servo support, create a file called user.properties in the top-level project directory and add enableServo=1. Then to enable Servo in Firefox Reality, go the Developer Options panel in the Settings, and toggle the Servo option. Then a new button will be added to the navigation bar. Clicking that button will reload the current page with Servo.
>Experimental Servo support
>To compile with Servo support, create a file called user.properties in the top-level project directory and add enableServo=1. Then to enable Servo in Firefox Reality, go the Developer Options panel in the Settings, and toggle the Servo option. Then a new button will be added to the navigation bar. Clicking that button will reload the current page with Servo.
https://github.com/MozillaReality/FirefoxReality