Used it for years, couldn't imagine using Youtube without it...

However, I have also very recently switched from W10 to Linux Mint and for some reason the volume boost sounds heavily distorted. Though I'm not sure if that's do do with the extension, FIrefox or Linux itself.

Used it so I didn't have to wear my headphones but still be able to hear audio with them on my lap/desk but I can't really do it with how bad it sounds at the moment.