I want to install firefox addon called "youtube video and audio downloader 0.3.5 by Chris. How can I check to see if it has malware

How can I check if the program 'youtube downloader video and audio by Chris 0.3.5 has malicious software.
When I go to download it has chain
https://addons.Mozilla.org/Firefox/downloads/latest/413644/addon-413644-latest.xpi?src=userprofile

I'm so nervous about downloading anything for fear of getting my hijacked browser or worse, because it's already happened twice. Any advice on this program or if there is a similar program to download youtube, who is known to be squeaky clean?

Too, I have youtube downloader video and audio 0.3.5 by Chris on FF but have not used a lot or not at all. Today, Avast gave me a warning (probably a Malware DB recent update) that this product has very bad side. My two main concerns are a possible Trojan and adware popups - horse for now that I only have those on a single site, The Pirate Bay, but they are devilishly difficult to get rid of.

Avast and some other malware utilities not come with Trojan horses, but I saw a EULA (on Board of another, may not be the same product) which explicitly stated the software would share information on the internet, probably tunnel through the firewall. Malware utilitie which would detect as a Trojan horse, or that they would assume that I installed it intentionally? How do they know?

Are modules which arise on the FF Add-ons Manager > get guaranteed by Mozilla addons?

Tags: Firefox

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