Adobe Express doesn't work in Firefox
When going to use Adobe express on Firefox it comes up with the following message, saying that this browser doesn't play well with others and that I should use Safari, Google Chrome, or Microsoft Edge instead.
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It’s one of their open tabs, actually.
What happens when the maintainer decides they don't care?
That's not quite accurate. If the site is popular enough Mozilla may ship a webcompat intervention in Firefox.
If the site is popular enough Mozilla may ship an intervention in Firefox.