Hi,

sorry if this is not the best place to file a bug but I found no working
bug tracker for context.

Environment:
Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0

Step to reproduce:
1. `firefox --safe-mode  # start firefox without add-ons`
2.a`context --version  # or --help, or without arguments`
2.b or: `mtxrun --script font --list --all`

Expected behavior:
Nothing surprising should happen.

Actual behavior:
Firefox suddenly eats 100% of cpu

I've noticed that `context` symlinks to `luametatex`, but the latter itself
does not trigger the bug, neither do `luatex` or `latex`, so I believe this
is a context-specific thing.

Best,
Sylvain