After upgrading from Ubuntu Karmic Koala to Lucyd Lynx, firefox was also upgraded. Its now version 3.6.3.  Firefox says Xinha is incompatible to its version. Im worried since it's my only wysiwyg html editor. Im planning to downgrade firefox. But before that, i tried searching a fiirefox add-on and look for wysiwyg. One of the result is Write Area. I read its description and I just found out that it converts <textarea> to html editor. Its pretty cool. I installed it. Then i am now using it. No downgrading happen. Installing and using Write Area is the same as Xinha. You can find it here.