Hi FredMcD, Thank you for your prompt reply. It is an investment website, www.aastocks.com, in which I can log on and click a button to check my portfolio, before yesterday. After Firefox update the software, I can still log in, but clicking the button sends me back to the log in page. I have tried clearing the cache cookies, removing the ad blockers etc but to no avail. Using the Microsoft Edge browser has no problem. Any thoughts? Thanks, George Yip