[Epiphany] Cannot set some prefs.js settings

[Martin Stubenschrott <stubenschrott gmx net>]

Hi,

I really hate it, when google only shows me 10 results at once, so I 
tried to edit the ~/.gnome2/epiphany/mozilla/epiphany/prefs.js file, 
and changed keyword.URL from "http://www.google.com/search?q="; to 
"http://www.google.com/search?num=100&q="; but after restarting epiphany 
it was reset.

I could change other settings like 
browser."dom_disable_open_during_load" with this way, and I made sure 
that there  was no epiphany running with "ps -A".

Moreover, I tried about:config but it didn't work this way either :(

Another thing I couldn't disable e.g. was the setting 
enable_automatic_image_resizing.

So, my question is, if and where I can change this settings?

best regards,

Martin