Developer tool for Mozilla/Netscape

Nifty tool­bar for Mozilla/Netscape from placenamehere.com. Seems to be a really good tool. Cur­rent fea­tures include:

Links to most W3C Spec­i­fi­ca­tions
Auto­mated sub­mis­sion to many val­i­da­tion tools
Hide & show style sheets
Apply your own exter­nal style sheet
High­light many HTML ele­ments
Resize Win­dow to spe­cific dimen­sions for test­ing
High­light form infor­ma­tion
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[via A Whole Lotta Noth­ing]