To make Userstyle, Since a long time, i use Firebug ( i can't lost this addon!) .
I can continue usiging it with Waterfox.
But yet i see a new problem :
When i edit an userstyle and preview the effect with firebug open , firebug stop to show my CSS code in the htlm panel.
If i reload the page , it show it.
I'm alone with this problem ???