1) Getting two context menus on sites that are using frames. to reproduce: open any page with frames, right-click any link in the frame, choose open in background or open in new window. now the link context menu disappears and the "normal" right-click context menu *appears*. the last thing should not happen...
2) If lots of windows are opened at the same time and one tries to open a bookmark from the netscape bookmark-plugin nothing happens. if i click on the entry or use enter no reaction from k-m can be seen. works later again if the other windows start or finish loading their pages. - perhaps a limitation from mozilla (load x pages at the same time)?
It may be opening in the most recently created window. If you select "Open link in background window" and then use a bookmark without clicking anything else, the link will be opened in the newly created window, rather than the active window. This will be fixed soon.
An url where the context menu problem can be seen is e.g. http://www.isdnphone.de/english/homefrm.htm. it has only few frame-links - i did not find a better site in the meantime - but it should do. :-)