Comment 54 for bug 477513

(In reply to comment #8)
>
> I ran the build, make, and install instructions without any errors. I rebooted
> my machine afterward to make sure I was running the newly compiled UIM.
>
> Unfortunately, it seems that has not solved the problem. Firefox still crashes.

Hmm, that's interesting.

Anyway, about the nspluginwrapper workaround, I found you need to setup nspluginwrapper manually after installing it on Ubuntu.

$ sudo nspluginwrapper -i /usr/lib/flashplugin-installer/libflashplayer.so

I think you can see npwrapper.libflashplayer.so is used after restarting Firefox (by inputting "about:plugins" in the URL box). Please let me know if it solves the crashes.