-e: see title
--fails on Chrome71 (both required flags enabled
--works on FF65+66(nightly)

-repro:
--open attached project (empty 3D template)
--enable Autoconnect Profiler
--build & run for Chrome
--notice empty scene is loaded with no errors
--open Editor\EnableThreads.cs
--enable threads via playersetting script
--build&run for chrome
--NOTICE it fails loading the scene throwing an error:
---Uncaught RuntimeError: float unrepresentable in integer range

--remove camera component from the scene
--build&run for chrome
--notice it works

--running a non-dev build throws no error