My Firefox works fine. So it doesn't seem to be the problem. Just wonder if all the soft there is updated.If it is the problem may be the Norton. The Norton may not recognise the updated Firefox as the trusted soft. Not sure what version of the Norton you run but please try to these steps...
- Start Norton Internet Security.
- In the main pane, click Norton Internet Security tab.
- Click Settings.
- Under Web Browsing, click Personal Firewall and then click Configure.
- In the left side of Norton Internet Security Options window, click Personal Firewall and then click Program Control.
- In the Program Column, select the specific program.
- Change the Access from Block or Custom to Allow.
- Click OK.