Use this link to check that your plugins are up-to-date. If any are listed as unknown or research, do not worry about them.

Type about:addons<enter> in the address bar to open the Add-ons Manager. Hot key; <Control>(Mac:<Command>) <Shift> A)

On the left side of the page, select Plugins. Make sure the ones you want to use are set to Ask or Allow.

Go to the web page. Once the page is loading, mouse to the address bar and Left click the icon. A window for displaying site information should come up. Select More Information. Now select Permissions. In the menu, Make sure the ones you want to use are set to Ask or Allow.

Java is not Javascript

Security Issue: Update your Flash Player Version 19.0.0.185
https://www.adobe.com/products/flashplayer/distribution3.html Note: Windows users must download the “Internet Explorer” and “Plugin-based browsers” installers.

Note: Edge on Win10 does not use ActiveX version but its own Flash.

See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

This is a very strange message...

Did they forget the word "not" in this sentence?

“Your browser is executing scripts on this page."

Why would they say this:

"If this message persists please make sure you are visiting a correct website"

It just seems suspicious for a site you know well to give you such a bizarre message.

It did seem odd to me also.

Hello,

In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see How do I create a screenshot of my problem?

Once you've done this, attach the saved screenshot file to your forum post by clicking the Browse... button below the Post your reply box. This will help us to visualize the problem.

Thank you!

You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

Thanks for your replies however the problem persists.

I had another company extranet user log in on his computer using my information and he was able to connect, so this confirms the issue is with my local computer settings. The system was working correctly prior to upgrading to WIN 10 and aside from uploading this software, I made no other changes to the other software I use daily.

FredMcD - I carried out all of your suggestions and I believe the settings are correct (appropriately turned on or off). Your comment about Javascript - can you elaborate please?

Pretty sure malware is not the issue as I've not been anywhere to get this.

In terms of a screenshot, there is nothing to see really - the message pops up in the page header and disappears in less than a second so I can't get a shot of it. When I try to log in, the response is always the same - "You are not permitted to log in"

Any help greatly appreciated.

Cheers,

ME

http://kb.mozillazine.org/JavaScript_is_not_Java

If all else fails, you could try videoing it with a camera phone. But without more to go on, it's difficult to tie it to a particular setting.