Good day!
Just joined the Character Tools Alpha and the pop-up for welcome to closed alpha has the erroneously bold weight font in Firefox at the bottom (both Adam’s name and title, as well as the Understood and acknowledged).
Thanks for sharing! We’ll take a look at it. 
Adding to this, it’s also happening on the character sheet: Initiative, Full Heal, Resistances, Conditions, Prepare Arcane Spellcasting, and to some extent on the Actions /Skill titles but as those two groups are a larger font they’re a bit more readable.