Lurker here coming out of the shadows. Sounds like an issue I had. The culprit in my case was the browser extension "Dark Reader".
I fixed the issue by adding Fastmail to the ignore list and everything returned to normal. The easy way to add Fastmail to the ignore list is to login and then open the extension. With the extension open, click on the box with the url in it and the checkmark will change to an 'x'. Now Fastmail is in the ignore list and the site should look normal again.
Hope this helps.
Peter
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