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by cabbageicefruit 665 days ago
Firefox has supported this since 125. So if you are on ESR 128 it should work fine

https://caniuse.com/mdn-css_properties_align-content_block_c...

1 comments

That is what the article claims, but... I see it as left-aligned. Firefox 129.0.1 on MacOS.
It should be left aligned, but it should also be vertically centered within the resizable black-bordered box.
I've just looked at it in Firefox 129 and it's vertically centered.