Comment 19 for bug 905636

Yes, it's not restricted to firefox. It seems to happen in all Gtk-3 text entries that, on typing, pop up helpful lists to choose from. This became gradually clearer only after I filed this bug report. Firefox is heavily used though, so it's particularly noticed there.

What I use to tell people is to disable the awesome popup while working with Onboard. We don't have a better workaround yet, unfortunately.

One thing I tried was, instead of sending fake key strokes, to insert text directly into the url bar via AT-SPI. However the url entry doesn't seem to support the editable interface, atspi_editable_text_insert_text() did nothing (works in e.g. gedit though).