No problem with tests, but for example with Opera and his questions about why Yandex " calling ", funny guy IMO as a simple quick search on Operas official security page reveal why.
security.opera.com
The rest should be easy peasy to grasp and understand as it's simply bookmarks/speed dials that is paid for as advertising from Facebook, Booking, Amazon, AliExpress etc. Remove those by simply delete them inside Opera on a fresh install.