(new Set(...)).values().filter is not a function

[NyanMC]

What happened?

Waterfox does not support Iterator.filter. Inputting new Set(['a']).values().filter(()=>true).toArray(); in the console produces a TypeError: (new Set(...)).values().filter is not a function. On regular Firefox, this outputs correctly. This has broken at least one website which I have tried to use.

On Waterfox 6.5.6:

On Firefox:

Reproducible?

• [x] I have checked that this issue cannot be reproduced on Mozilla Firefox.

Version

G6

What platform are you seeing the problem on?

Windows

Relevant log output