Hi Rasmus:
This looks great for me in every browser – are you viewing this on a retina or non retina screen?
Can you see if disabling ‘Use Webkit Graphics Acceleration’ resolves this issue for you? Also, if you can set the ‘scale’ of that text to be 1.0 (instead of .75)this might also encourage the browser to render it correctly.
Some browsers do have an issue with text transformed on the X or Y axis, but I can’t personally reproduce this. A quick workaround if you need to get this out is to render that text as an optimized PNG.
Here’s what I see in Firefox 62.0.3: