I can't install Firefox extensions

[terry]

Hi,

Does anybody have the same problem? 
Since I upgraded to breezy I can't install any extension. I've removed
the package completely and reinstalled to not avail. In the javascript
console I've found the following errors:

        Error: uncaught exception: [Exception... "Component returned
        failure code: 0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)
        [nsIXPCComponents.lookupMethod]"  nsresult: "0x80570009
        (NS_ERROR_XPC_BAD_CONVERT_JS)"  location: "JS frame ::
        chrome://global/content/XPCNativeWrapper.js :: anonymous :: line
        91"  data: no]
        
        Error: [Exception... "Component returned failure code:
        0x80004005 (NS_ERROR_FAILURE) [nsIRDFContainer.Init]"  nsresult:
        "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame ::
        file:///usr/lib/mozilla-firefox/components/nsExtensionManager.js :: nsExtensionsDataSource_addDownload :: line 4100"  data: no]
        Archivo de origen:
        file:///usr/lib/mozilla-firefox/components/nsExtensionManager.js
        Línea: 4100
        
Any idea?

Thanks,
Javi