If you use the Stylish browser extension, you ought to have a read of this. It might make you want to uninstall it immediately, as I did.
It appears that last year Stylish began collecting users’ data, including their full browser history, and even the contents of Google search results.
The above blog post explains exactly what is going on, and why it is a problem.
This is a great shame because Stylish provided a brilliant function enabling you to improve bad or unsuitable web designs very easily. I even created a style that improved the user interface for live timing on Formula1.com — which I still used up to last weekend, and has been installed by almost 500 others.
Not any more — I have uninstalled Stylish from my browser.