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when I opened up my pc this morning, I have an update 4.9.22 video downloadhelper that popped up on the screen, is this safe?

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I don't see who this is from or if I can trust this site, this pop-up covered the whole page.

I don't see who this is from or if I can trust this site, this pop-up covered the whole page.

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This is a Firefox add-on. (View Page)

Please remember that Firefox add-ons are not created nor maintained by Mozilla. They are use at your own risk.
The add-ons on the Mozilla add-on website are reviewed for security threats, so I would say that this update is safe.