WebGL recently started failing here, console reports: > Error: WebGL warning: Failed to create WebGL context: WebGL creation failed: * Error during native OpenGL init. * GL error 0x500 occurred during WebGL context initialization! * Exhausted GL driver options. Reducing the sandbox level from 3 to 2 restores proper function. With enabled sandbox logging, stderr contains some interesting lines: > Sandbox: SandboxBroker: denied op=readlink rflags=0 perms=0 path=/sys/dev/char/226:0/device/subsystem for pid=3236 > Sandbox: Failed errno -13 op 10 flags 00 path /sys/dev/char/226:0/device/subsystem > Sandbox: SandboxBroker: denied op=readlink rflags=0 perms=0 path=/sys/dev/char/226:0/device/subsystem for pid=3236 > Sandbox: Failed errno -13 op 10 flags 00 path /sys/dev/char/226:0/device/subsystem > Sandbox: SandboxBroker: denied op=readlink rflags=0 perms=0 path=/sys/dev/char/226:128/device/subsystem for pid=3236 > Sandbox: Failed errno -13 op 10 flags 00 path /sys/dev/char/226:128/device/subsystem > Sandbox: SandboxBroker: denied op=readlink rflags=0 perms=0 path=/sys/dev/char/226:0/device/subsystem for pid=3236 > Sandbox: Failed errno -13 op 10 flags 00 path /sys/dev/char/226:0/device/subsystem > Sandbox: SandboxBroker: denied op=readlink rflags=0 perms=0 path=/sys/dev/char/226:0/device/subsystem for pid=3236 > Sandbox: Failed errno -13 op 10 flags 00 path /sys/dev/char/226:0/device/subsystem > Sandbox: SandboxBroker: denied op=readlink rflags=0 perms=0 path=/sys/dev/char/226:128/device/subsystem for pid=3236 > Sandbox: Failed errno -13 op 10 flags 00 path /sys/dev/char/226:128/device/subsystem > libGL error: MESA-LOADER: failed to retrieve device information Nightly 56.0a1 Mesa 17.1.5 Arch Linux x86_64 Intel Haswell GT3e