WARNING: Ads on YouTube can use miners on your browser
There are some incidents that ads on youtube.com can spawn miners on your browser.
When watching a video, when your progress bar touches "yellow area", CPU usage can jump up to 100%.
Source (in russian): https://pikabu.ru/story/ostorozhnee_s_youtube_okh_uzh_yetot_mayning_5631802 Is there a browser addon or another tool that can identify miner webpages?