Hi, thanks for replying. After posting last night the problem continued so I looked in Help under the heading "Error happens when accessing certain websites" it said this.
If the error happens only on a specific website, you can block scripts from running on that website. Many sites still function even if scripting is disabled.
Install the YesScript extension and restart Firefox.
Open the Firefox window, click the Tools menu and select Add-ons.
In the dialog that comes up, click on the YesScript entry.
ClickOptions.
In the YesScript Blacklist dialog, type the URL of the site that's giving you problems in the text box.
Click Add. The domain name of the site will be added to the list.
Now that the problematic site has been blocked from running scripts, it will no longer cause unresponsive script warnings.
I'm wary of installing the download suggested in case it affects other online activity. As the problem only happens here I'm cautious of making any changes to the pc. After the recent changes here maybe it's related to that and one of the tech staff could check out the "scripting" on the page as it's frustrating to keep getting the message.