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Adobe Express doesn't work in Firefox
(lemmy.ca)
A place to discuss the news and latest developments on the open-source browser Firefox
Yes, I am sadly well aware of the prevailing situation.
But on the other hand, by and large complete cross-browser HTML compliance is not that hard though. A couple extra couple hours to verify your code works everywhere instead of just the one engine isn't all that huge a sacrifice. I really feel like probably 9 out of 10 companies are putting up barriers to Firefox just because they are lazy not because it doesn't work (or couldn't work with a couple tweaks.)
Most aren't writing fully by hand. They are using automated scripts/snippets provided by their tools.