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I'm sorry but firefox is updaated.I have tried from another computer and everything works fine in firefox. So the problem is with my configuration and firefox addon, perhaps

I found the problem is with firebug 1.9.1, but why? mystery?

I'm sorry but firefox is updaated.I have tried from another computer and everything works fine in firefox. So the problem is with my configuration and firefox addon, perhaps

I found the problem is with firebug 1.9.1, but why? mystery?

Though you have 10.0.1? Am confused, is FF up to date or are you using 1.9.1? It's possible for a browser to have a bug and of course cause a site to render incorrectly. It could also just be browser cache, which you can clear by completely closing the browser and re-opening it or manually clearing it from Firefox > History.

The problem appears when the add on firebug is enabled. when it is disabled, the website correctly works.

I'ms orry but 1.9.1 is the version of Firebug and not that of Firefox.

see you later

Strange, I've Firebug 1.9.1 as well and it's working fine. Not sure what else to tell you. Seams to be some sort of browser or browser extension related issue.