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That only means the developers didn't care if it was fast, or even works, in other browsers. It says nothing about Firefox. The first sentence, where the author complains that JS heavy apps are too slow in Firefox, is the part that's about Firefox.

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What the OG commenter meant (as I read it) was that the page was slow in FF solely because the developer didn’t test the page in FF.

It does in no way imply that FF is worse than Chrome, but it does imply that (some) web developers are lazy.

That sentence is a simple statement of fact - that some apps are too slow in Firefox. It places no blame for the slowness. The blame comes later, and is put on lazy developers.

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