Firefox management of subsidiary widgets

Hello,

I was trying to find a solution of my problem, but i already modified so much css that I decide to download again the theme and create the same situation on the virgin theme.

Firefox doesn’t support the search widget : the submit button doesn’t fit the layout.
(that wasn’t my biggest problem I already fixed it with few css)

Firefox doesn’t support more than 2 widgets on the subsidiary area : the two first widgets fit perfectly the layout of the page, then the third fourth and so on widgets are just blown away on the right. They don’t go under the first one.

I guess it’s a padding problem with Firefox..

I searched for two days already and I can’t find any solution, if someone could help me it’ll be very helpful.

Thank you for your answers

MG