OK thanks for the replies.
I've just installed firefox-esr (I'm using OpenSuse) and it works well....But doesn't work with the "standart" version on opensuse...don't know why... I will ask jondofox opensuse packager
EDIT: I found the problem it's because I used "firefox-branding-opensuse". Now I use the branding-upstream and works well !
Questions about organisation, special technical questions, troll plain