Norton Toolbar block internet (with Firefox 40) WIN 7

Hi, Im getting in the last few day an issue with Firefox and Norton Toolbar.

Sometimes works very well but then without doing anything I have not Internet Access. (But in Internet Explorer. On it do have Internet Access.)
Therefore I started to look into the Firefox Add Ons and I find out that the problem is the Norton Toolbar.

As soon I turn the Norton Toolbar OFF I have Internet Access again on Firefox.

Does someboy have the same problem?

On Internet Explorer (there is not a Norton Toolbar) I have allway Internet Access.

My pc:

Windows 7
Norton Security Online mit Backup  Version 22.5.2.15
Firefox 40.0.3

Thanks!

Esteban