Rated 5 out of 5 stars

Poor HTMLValidator, poor Marc.

Firefox has problems but all we notice is that an extension is not prepared to cope with the bad attitude of the Firefox-developers.

I love this extension and will rather stop using Firefox than do without HTMLValidator!

Having overcome the worst trouble with the 10.x releases of the browser, I am glad to say, that the extension works fine under Linux 64Bits.

This review is for a previous version of the add-on (0.9.5.1).  This user has a previous review of this add-on.