As per bug 255942 comment 26... The patch for bug 255942 (attachment 225367 [details] [diff] [review]) has accidentally reversed the fix for bug 336012 (attachment 224887 [details] [diff] [review]) and rebroken it. It is only the change to content/base/src/nsCopySupport.cpp that is important. The only reference to that file in the bad patch is specifically to reverse the change of the other bug. It doesn't seem likely that this was intentional so I'm not sure what was really meant to happen there. Perhaps the wrong file (or file version(s)) was diffed in generating the patch. Regardless, the change needs to be reversed (or rather re-reversed). Basically, reapply attachment 224887 [details] [diff] [review], but only the section that applies to nsCopySupport.cpp.

Fixed.

Sorry about that. Verifying nsCopySupport has had attachment 224887 [details] [diff] [review] reapplied.