Revision 1630, run the whole test suite on Firefox 1.0. Easiest way is to grab Portable Firefox from here:
http://prdownloads.sourceforge.net/portablefirefox/Firefox_Portable_1.0.8_en-us.zip?download
TestClick fails towards the very end, right after the part where we "Click a link where onclick returns false". Immediately after that we attempt to re-open the page we're already on; this works in other browsers and in other versions of Firefox, but fails in FF 1.0 (in both multiWindow and singleWindow modes). TestFramesClick (which is a copy-and-paste of TestClick, but run in a frame) fails in the same spot.
It's hard to say why this is, especially since TestOpen tries to open the same URL three times in a row and passes.