Hey @JvP,
Thanks for writing in. I tried pulling this up on Firefox here on my Mac as well as via Browserstack as I don’t have a Windows machine to test on in person (tried Firefox v58 on Windows 7, Windows 8.1, and Windows 10). Regretfully, in none of my tests on Browserstack was I able to reproduce this issue. That being said, everything comes back slightly fuzzy since it’s streamed back when testing via their service, but the text in the tooltip didn’t appear any more fuzzy than the rest around it (and it is very slight).
Kind of a tough one since we can’t replicate, but we’ll keep an eye out for it and if any ideas come to mind of what is causing it, we will certainly see what we can do.
Thanks.