Pytyvõha aty Firefox rehegua

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.

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.

For the last couple of months I've been having an issue with Firefox freezing when I bring up a news article on Yahoo. It only happens when there is a video attached to the article, the video and the text of the article won't load. After a few minutes there is a message saying "This page is slowing down Firefox. To speed up your browser, stop this page". All of the Yahoo news articles work fine when I bring them up in Chrome. How can this be fixed??