User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1 Build ID: 20111220165912 Steps to reproduce: I logged onto www.qb64.net/wiki. Actual results: the sidebar (with search ect.) does not display on the window (a lesser problem with the same site has to do with copying the code windows in the wiki) Expected results: the sidebar should have displayed properly it displays correctly in IE (though I rarely use that problem except to verify problems like this myself)

The result is a little bit inconsistent. Seems important to use clean profiles when reproducing. Maybe bug 679971 explains that. Reproduced with a new, clean profile: Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1 Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20100101 Firefox/10.0 WFM with a new, clean profile: Mozilla/5.0 (X11; Linux x86_64; rv:11.0a2) Gecko/20120118 Firefox/11.0a2 Reproduced with a new, clean profile: Mozilla/5.0 (X11; Linux x86_64; rv:12.0a1) Gecko/20120118 Firefox/12.0a1

Confirming as a tech-evang bug. Broken browser detection on that site (taintEnabled-based) makes it apply workarounds for Webkit bugs that don't exist in Firefox. When you're trying to work around bugs that don't exist, things break.

This is working for me in Firefox 32.0.3