Unsolicited by me, a new tab will open saying I need a new video player or PC cleaner. Why? And how do I stop that?

Sometimes, when Firefox has been open on my laptop for a few minutes but I've not been active on it, a new tab will automatically open up with a message saying, for example, that I should download a new video player or some PC cleaner software. I know it must be some kind of spam or malware, and I normally just close the tab, but I'm curious as to why this happens and how I can stop it from happening again.

That says a plugin needs updating. Open '''''Firefox > Add-ons > Plugins'''''.
Above the first plugin is a link that will check your plugins. Please use it.

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