When I logged in this morning, I saw that Google Chrome now classifies one of the extensions I have installed, "AdBlock for YouTube", as malware: an info box now says "This extension contains malware." I didn't find any official info on the decision, and very little chatter online.
Only thing I found is this screenshot here on Reddit: https://www.reddit.com/r/youtube/comments/16hy2of/the_extension_adblock_for_youtube_has_now/
The decision might be related to some cheeky / deceptive fake YouTube Premium modal banner? https://www.reddit.com/r/youtube/comments/1601py2/why_is_youtube_forcing_this/
Either your extension is indeed malicious or YouTube started playing dirty.