Last good nightly: 2010-05-03 First bad nightly: 2010-05-04 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=83c887dff0da&tochange=d6bb0f9e9519
Sounds like the HTML5 parser prefetch at work. The script is not executed, of course. I suppose we can condition it for scripts on whether script is enabled for the document... In particular, nsScriptLoader::ProcessScriptElement does an enabled check, but nsScriptLoader::PreloadURI does not. Jonas, any objections to adding it?
Created attachment 543332 [details] [diff] [review] When scripts are disabled, don't bother preloading them.
This bug fix is listed on Firefox 8 for developers.