`show-whitespace` missing from file viewer

[jrappen]

Description

The show-whitespace feature doesn't work on Waterfox (G6.0.19) on macOS (Sequoia 15.0).

How to replicate the issue + URL

Feature is enabled by default.

Feature's code:

https://github.com/refined-github/refined-github/blob/main/source/features/show-whitespace.tsx

Test URL linked from the feature's code:

refined-github/sandbox#18

Extension version

24.4.9

Browser(s) used

Waterfox (G6.0.19)

Token ⚠️

• I set a token in the options page. I understand that some features require a token to work.