yes, I tried, and today I try again because I believe in you
I said 2 days ago what is this awful blue color and I didn't see :
If you want the original page colors, set the pref user_pref("browser.display.use_document_colors", false); in both files named prefs.js in the main folder as well as in in the defaults folder to user_pref("browser.display.use_document_colors", true); before you burn the cd.
So now all is ok, thank you guy ^^