Steps to replicate the issue (include links if applicable):

• Example: https://be.wikimedia.org/wiki/Wiki_Loves_Monuments/2023

The following CSS seems not to be properly rendered by Firefox:

{|
| style="column-width:25em; column-count:3" |
...
|}

What happens?:

• Chromium-based browsers are correctly dynamically rendering up to 3 columns depending on the (device) screen width (wide screens have 3 columns, smaller screens have 1 or 2 columns)
• Firefox wrongly shows 1 single column on all screens, independent of screen width.

What should have happened instead?:

Firefox should respond to the CSS the same way as chromium-based browser do.

Other information (browser name/version, screenshots, etc.):

Problem seems to occur with non-chromium-based browsers.