I already made a review on the opera webshop, but maybe here you look more often.
I like it very much but apparently there is a multi plugin issue. I'm using it along with YouTube Anti Translate(I cannot add url, so replace spaces with dots: addons mozilla org/en-US/firefox/addon/youtube-anti-translate/) and Clickbait Remover for Youtube(addons mozilla org/en-US/firefox/addon/clickbait-remover-for-youtube). When all of three are on, the video page will freeze. If I disable just any of those, it starts working. I tried multiple browsers, chromium and firefox based. Of course the greatest burden is You Tube Anti Translate, but the youtube still works with it and one more plugin. Hopefully you can find the issue.