Sounds like your issue is unrelated to Firebug (as Firebug doesn't send requests by itself) but rather related to another add-on accessing the W3C validator. How do you access the validator?
Sebastian On Monday, May 18, 2015 at 8:53:26 AM UTC+2, David Tostig wrote: > > Since the last update to Firebug 2.0.9 on Firefox 37.0.2 I am getting a > '403 Forbidden' and 'Banned for excessive use' reports back from W3C on the > very *first* attempt to validate a page. I can't ever imagine having made > 200 or so frequent requests like the screen tells me I've made, so what's > going on? > > David > -- You received this message because you are subscribed to the Google Groups "Firebug" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/firebug. To view this discussion on the web visit https://groups.google.com/d/msgid/firebug/d0fd3f38-5ac0-4bed-bdbd-e19743e6922b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
