Help! Why is everything underlined while I'm typing?

First off, sorry if I’m totally in the wrong place—I honestly have no clue where this question belongs.

So, here’s the deal: I use Mozilla just like I use IE, and yesterday, right in the middle of typing up a post here, every single word started getting these wavy red and blue underlines! 😲

It looks terrible and it’s driving me absolutely insane.

Now, I can't tell if I accidentally clicked something myself or if my kid was just messing around on the keyboard and mouse while playing games... they tend to go a bit wild with the hardware.😁

For instance, this is what it looks like (I was just typing some random stuff late last night) (and just so you know, the red is actually much brighter and more vivid in person!!)



But this is how it’s supposed to look when I’m typing, which is how it appears when I'm using IE:



Is there any way to just turn those underlines off?

Thanks!! 🙏🙏

Sorry again if I'm out of line here....🙏 😉

take a look at this:

Found it!! 🙏🙏

Seriously, thank you so much!!!!!!!!!!!

Just checked—the lines are finally gone...🙏🙏🙏

👍👍