Firefox is my preferred browser. I have it running on several devices. Recently (within the last two days) I have not been able to sign into Outlook.Live.com on my Acer Laptop running Win10. I get a "something went wrong" message. Also, I can not open MSN.com. The MSN splash screen sits there with the progress bar dancing back and forth but nothing happens. I tried opening Firefox in troubleshooting mode but the same thing happens. I am able to successfully open both of these pages using MS Edge on the same device. I can open the Bing page (another MS site) in Firefox and it functions as usual. I also have Firefox on a Compac Presario Laptop running Win10. The same thing happens there. That laptop also has Chrome installed and both Outlook.Live.com and MSN.com work properly on that laptop with the Chrome browser. That same Compac Presario can be booted to Linux Mint. In that mode I have a copy of Firefox for Linux. When I use that, both Outook.Live.com and MSN.com work properly. Has there been a recent change to Firefox which might cause this behavior? What else can I do to troubleshoot this problem? Thanks Gary