The switch to the new owner of Stylish had massive privacy implications. SimilarWeb is known for its analytics offerings and it appears that the company collects browsing data from Stylish.
Users who install Stylish are automatically opted-in to sending anonymous data to Stylish. Stylish does include an option to opt-out of that in the extension options.
Robert Heaton analyzed Stylish's data collecting recently and discovered that the extension sends a user's complete browsing history back to Stylish servers. The data is linked to a unique identifier so that all of a user's browsing history can be linked together.
It is even worse for users who have an account on userstyles.org, a property owned by SimilarWeb, as Similarweb could link accounts to the browsing history.
https://www.ghacks.net/2018/07/03/it-is-time-to-get-rid-of-stylish/
Enjoy your zond.
