What is my browser sharing with websites

[Shonk]

I picked up the Sapphire RX Vega 64 Nitro+ on offer the other week
and just went to redeem the code at amdrewards for the games on the bedroom pc (that doesnt have the vega in it it has a R9 290 in it)

and straight away it said for me to install my qualifying card
i was expecting that i would have to run some app tbh on said pc
and not that they could pull said info from my browser
i have everything turned off webrtc etc in firefox

anyway went downstairs and fired up the pc with the vega in it
and it knew straight away and let me redeem the code

does anyone know of a site that will tell me the exact raw info that my browser will supply on request
i have tried mybrowserinfo and such loads of times in the past but nothing has indicated
they can see so far into my system as to see my gfx card model

its a bit creapy tbh

 

[Shonk]

seems to be leaked via webgl

Platform: Win32
Browser User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0
Context Name: webgl2
GL Version: WebGL 2.0
Shading Language Version: WebGL GLSL ES 3.00
Vendor: Mozilla
Renderer: Mozilla
Unmasked Vendor: Google Inc.
Unmasked Renderer: ANGLE (Radeon RX Vega Direct3D11 vs_5_0 ps_5_0)
Antialiasing: Available
ANGLE: Yes, D3D11
Major Performance Caveat: No

WebGL 2 Functions Implementation Status:

88 of 88 new functions implemented.

 

[Vidar]

Read up on browser finger printing its quite worrying really.