Hi,
the items in the header are looking a little out of sorts:
First, the white gradients under each item in Blender News. That’s been there for maybe a month or so.
Second, the font. Switching from Linux Mint 18.3 to 19.2 and Firefox 68 to 69, I see these very basic fonts here (elsewhere is fine). I’m not sure which change (if either) made the difference.
Just little things 
edit: for comparison, back in lm 18.3, ff 68:
edit 2: upgraded ff 68 to 69. No change, so firefox version doesn’t matter, just the OS.