For me it's almost always from com.com, which is where the images here on Cnet come from. It's reporting irregularities in the code it encounters, which doesn't always follow the set standards to the letter, but as long as it works it's fine by me.
I just started useing Firefox a couple of weeks ago and noticed under tools Java Script Console it shows a lot of red or pink errors. I have Java Virtual Machine 1.5.0_07 and running Windows XP home edition. There doesn't seem to be a problem just wondered it this is a problem. Thank you for any info you can give me. Still getting used to firefox.