Source code highlighting missed on Windows

### Short description

I was trying to open an article with source code inside

### Expected behaviour

I expected that code will be highlighted like in macOS

### Actual behaviour

I saw that code is black as coffee.

### Steps to reproduce

On [Windows + Chrome, Windows + Opera]
1. Open article with source code
2. See that code is not highlighted

On [Windows + Tor Browser]
1. Open article with source code
2. See that code is highlighted
3. Reload page
4. See that code is not highlighted
5. Now it is not highlighted for ever 😱

### On which platforms did you notice this

This issue annoys me on [Windows 7, Chrome + Opera + partially Tor Browser].

### Image