Hi, for being only 2mos old your Video Card Drivers need to be reinstalled and then possibly left alone. Most of all the drivers have errors, Firefox likes good drivers. adapterDescription: NVIDIA Quadro P4000 driverDate: 4-22-2018

disabled = bad u'blacklisted = bad u'unavailable = bad

featureLog: {u'fallbacks': [], u'features': [{u'status': u'available', u'description': u'Compositing', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'HW_COMPOSITING'}, {u'status': u'blacklisted', u'description': u'Direct3D11 Compositing', u'log': [{u'status': u'available', u'type': u'default'}, {u'status': u'blacklisted', u'message': u'#BLOCKLIST_FEATURE_FAILURE_BUG_1457758', u'type': u'env'}], u'name': u'D3D11_COMPOSITING'}, {u'status': u'unavailable', u'description': u'Direct2D', u'log': [{u'status': u'unavailable', u'message': u'Direct2D requires Direct3D 11 compositing', u'type': u'default'}], u'name': u'DIRECT2D'}, {u'status': u'disabled', u'description': u'Direct3D11 hardware ANGLE', u'log': [{u'status': u'unavailable', u'message': u'D3D11 compositing is disabled', u'type': u'default'}, {u'status': u'disabled', u'message': u'D3D11 compositing is disabled', u'type': u'env'}], u'name': u'D3D11_HW_ANGLE'}, {u'status': u'blacklisted', u'description': u'GPU Process', u'log': [{u'status': u'available', u'type': u'default'}, {u'status': u'blacklisted', u'message': u'#BLOCKLIST_FEATURE_FAILURE_BUG_1457758', u'type': u'env'}],

http://www.nvidia.com/download/driverResults.aspx/115280/en-us Note : Bottom of the URL

Note, it is a Dell You want the full version Installer not a update

After you have figured out your Video Card Drivers see what happens with the page.

Thanks for your reply Pkshadow.

On installing this driver R375 U5 (376.84), the system crashed but on restart and reinstallation the same error  (as originally posted) came up.

I have now installed the most recent driver R390 U7 (391.89)- still have this problem. It's an annoyance, but I can open the newspaper site with MS Edge so it's not disabling. This is the only site so far that I have found this problem. My laptop (less advanced system win 10) is ok so the website works. It's frustrating as Firefox seems to be better to use for this site than Edge

This issue can be caused by corrupted cookies or cookies that are blocked.

• check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"

Clear the Cache and remove the Cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" from websites that cause problems:

• Options/Preferences -> Privacy & Security
  Cookies and Site Data -> Manage Data

"Clear the Cache":

• Options/Preferences -> Privacy & Security
  Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Hi cor-el, thank you for your detailed reply I have systematically worked through your list and read the mozilla support articles. The problem occurred in safe mode and I tried uninstalling Java but to no avail. It's after 1 am here and I'll have another try in the morning just in case I've missed something I do appreciate the support from the forum

You're welcome.

If you use a bookmark then navigate to the web page starting with the main page or the sign in page in case there is a problem with this bookmark.

Success!!!! I was about to go to bed, but decided to do another restart, reinstalled Firefox and went to safe mode- all ok. Then went to normal and it is ok. Thanks to you both cor-el and Pkshadow, I've learnt a lot about Firefox through your efforts. I'm not sure what finally did it, but am suspicious it could have been the restart after Java was uninstalled. To my recollection the other steps were the same but the restart may have helped with these steps. (By the way I wasn't using bookmarks) Much appreciated