I run Firefox zoom at 120% by default (QHD), this is the only image I have noticed that does this.
Then main logo does not look great for me. (A)
If I turn off...
image-rendering: optimizeSpeed;
image-rendering: -moz-crisp-edges;
...it looks good. (B)
Click the image below for comparison, it actually looks ok in this post as scaled.
Not a deal breaker, just thought I would point it out. 
