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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.

There seems to be something specific to the Phlearn site and Firefox which prevents videos from auto advancing. They either recommence the just completed video or revert to an earlier one.