Yonke imikhiqizo Isithangami Sokwesekwa

Windows 10. Weird glitch.

If I use Wondershare UniConverter's downloader function to download a video, as soon as the download starts, all Firefox open windows close. This is a recent thing, the last couple of weeks or so. I have reinstalled Firefox and UniConverter. The first time I tried it after reinstalling UniConverter, all was well. But the same issue has shown up again. I have tried rebooting my PC to no effect.

Any bright ideas welcome!

I keep several email tabs open that have topics I am currently working on with clients. Recently they have been turning blank, so I have no idea what they are--I feel I have lost info that I need to do business. Why do they turn blank? I need this fixed ASAP!

Just a short time ago Version 125.0.3 downloaded. Since then I cannot open Youtube without it crashing. When I ask it to restore the tab (one of 2 choices offered, it crashes again. After 4 or 5 times I close the tab and switch to another browser. I shut off the one extension I had running. That fixed nothing. I looks like my 2019 iMac is too old and I need to go back to an earlier version.