I had never heard of histoplasmosis. Neither has Firefox apparently as it wanted to correct the spelling. I know “histo” means lungs, but the “plasmosis” suffix made me think about toxoplasmosis (FF has not heard of that either! The dictionaries are likely limited to common words, I would think.).

What’s the difference? Plenty!

https://www.differencebetween.com/what-is-the-difference-between-histoplasmosis-and-toxoplasmosis/

Edit: I’m a dummy. Histo means “tissue”. Not lungs.