The browser tab (Vivaldi, probably Chrome as well) becomes unresponsive for up to 10 sec after any Wikipedia page is loaded or refreshed. This happens even if the "wikipedia.org" is added to the extension's whitelist.

Steps to reproduce:

1. Open this url in a new tab: "https://en.wikipedia.org/wiki/Cryptocurrency"
2. Start scrolling the page up and down with the mouse wheel.
3. Watch the browser tab freeze completely for several seconds shortly after the page was loaded.