Has Firefox indicated that there are any issues with secure site certificates? Some users who have saved exceptions for sites discover that the exception only applies to the text, and all the style rules that lay out the text are still blocked.

If there are certificate issues: After getting Windows 10, many users are updating their security software or enabling parental controls during or shortly after their Windows 10 upgrade, and Firefox may need to be set up to work with those changes.

Do you use Avast, BitDefender, ESET or Kaspersky security software?

If not, could you try disabling Microsoft Family Safety: http://windows.microsoft.com/en-us/windows-10/turn-off-microsoft-family-settings

I do use Avast and that was my problem turned it off and all is good Thank you for the quick reply

I think you only need to turn off the encrypted scan portion of the Web Shield, you can keep scanning non-secure connections. I saw these steps in another post:

1. Open the Avast dashboard on the affected system.
2. Select Settings from the left sidebar menu.
3. Switch to Active Protection.
4. Click on Customize next to Web Shield.
5. Uncheck the "Enable HTTPS Scanning" option and click ok.

http://www.ghacks.net/2014/10/31/avasts-https-scanning-interferes-with-firefox-and-other-programs/