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Switched at the mere mention of losing my adblock. Have never looked back (besides when some shitty dev doesn't make their website compatible, looking at you comed)
You can file an issue at WebCompat. If they can reproduce it, they will contact the website.
Plus I'd like to add that while it is the developer's fault to only test in chrome, they have deliberately not respected established standards and used their market share to enforce the use of new standards that aren't compatible with other engines.
An example: If I understand correctly, Edge used to be non-chromium based, but was more or less forced into it by deliberate design choices that would, for example, result in youtube contents only being displayed correctly in chrome. People would blame their browser and swap. That is how you abuse the power your have from having the biggest marketshare to increase your marketshare.