Change the file browser in firefox

I didn't realise that so many people did not know how to change the default file browser in firefox. Admittedly, I had to do an amount of searching to find out how to do it as well. To prevent me from forgetting how to do it, I'm going to post it here.

1. enter about:config in the URL bar
2. enter platform in the search bar of the about:config page
3. The only available result should be ui.allow_platform_file_picker
4. Change the value of ui.allow_platform_file_picker to False
5. Enjoy KDE file browsing if you are on KDE. No more sucky Gnome file picker

Update: on openSUSE 11.3 I just tried this and I found that the value for ui.allow_platform_file_picker was already False. Firefox was also using its own sucky file browser (or Gnome's). So what I did was change the value to True and it worked - I now have KDE's file browser. So just toggle the value and see if it works for you...