I-Firefox Isithangami Sokwesekwa

While using Yahoo email I tried to access the 'Notepad' page and get a message saying to Download a new version of Firefox to see the 'Calendar' even though I was trying for the 'Notepad' not the 'Calendar'. If I try for the 'Calendar' I initially get the small right-sidebar version fine but if I ask for the full page version I get the error message again. This does not happen if I access Yahoo through Chrome-browser. I have repeatedly done the download to no avail. (I have version 99.0.1). I am attaching a screenshot of the error message. Thanks for any help. No rush.

Recently my Firefox crashes sometimes when downloading a file for example from Yahoo mail. This is not happening always, but sometimes when downloading a file. I have the latest version of Firefox, Windows 10. I changed password, deleted cookies, did full virus scan, but the problem still persists. Is this an issue of the new version of Firefox and will be fixed with the new update of Firefox ? This is happening only with Firefox and not with other browsers.