when I install the latest fcitx5 on the kde desktop environment. I use the system settings to set fcitx5 autostart. I reboot my computer. The input method can't switch on the firefox,but the konsole can. When I restart the fcitxt5, the problem disappear. Also, when I use the command "cp /usr/local/share/applications/org.fcitx.Fcitx5.desktop ~/.config/autostart/" to set fcitx5 autostart, there is no problem.
Maintainer informed via mail
Now the problem disappear.