I cannot access my share portfolios on Hargreaves Lansdown web site which they said was to do with a recent Firefox update.

I don't see anything reported for <code>hl.co.uk</code> — they can always file a bug if there's a functionality that has changed behavior or they feel does not match the standards. There's also the "Report Broken Site" tool in your browser menu that you can use to submit the issue. There are a few things to verify first, in case it's a local/intermittent problem: # Please check if you have [[Enhanced Tracking Protection in Firefox for desktop|Enhanced Tracking Protection]] (ETP) enabled. You can do that by clicking the shield [[Image:Fx89ShieldIcon]] icon in the left part of the address bar. If ETP is enabled, try disabling it. # If the problem is not fixed, try [[How to clear the Firefox cache|clearing Firefox cache]]. # If it does not help, try [[Clear cookies and site data in Firefox|clearing cookies and data]] for the website you experience troubles with (''warning: you will be logged out on this website''). # If it also does not help, try [[Diagnose Firefox issues using Troubleshoot Mode|running Firefox in Troubleshoot Mode]]. If the problem doesn't persist, please follow the steps from [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems | this article]] to troubleshoot further. # If the issue persists even in other browsers (e.g. Chrome, Edge, Opera or Safari), it is most likely an issue on the website's side. You may want to inform the website owner or administrator about that. #* If it doesn't, that's a compatibility issue. Please report it on [https://webcompat.com/issues/new WebCompat], so that the team there can look into it.