Firefox spellcheck question

I have noticed that the built in spell check underlines words not spelled correctly with a thin, barely visible red line. Is there some way to make this red line a bit bolder? I can hardly see it.

Or is there another recommended spell check add-on that I could use that has a bolder misspelled word indicator?

thanks

 

You can try the Spellbound extension but I dont remember if it does what you want.

 

I'd guess that the built-in one might, surprisingly in this day and age, have been designed for lower screen res. I'm still running at 800x600 and have no problems with its visibility.