I’ve not used LibreWolf, but assuming that Firefox addons are generally compatible, it might be worth trying Chrome Mask. It’s made by a Mozilla employee.

Hurry, you fool
Hurry and go
Save me your speeches
I don’t wanna know!

Glad it wasn’t too subtle!

Or the Son of God.

That’s what you say, you say that it’s not. 🎶

They’re presumably talking about the Kursk Oblast. Edit: probably not, see responses.