Spyware, as mentioned by others.

Spyware addon. It tracks your browse history.
Use stylus instead.

This addons track all of your history, please consider changing your behaviour, more over it's not compliant with the European GDPR

Spyware!

https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

This is spyware. If you don't want the every single url you visit to be sent to the owner's servers (THIS INCLUDES YOUR TOKENS WHICH YOU LOG IN WITH, AND YOUR USERNAMES WHICH CAN CONTAIN YOUR REAL IDENTITY).

See this article: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

!!!SPYWARE WARNING!!!
This add-on sends ALL of your browser history to some US company, without any hint about that and without asking you in the first place.
DO NOT INSTALL THIS EXTENSION!
Read more: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

Spyware: http://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

Also: The original Stylish extension was abandoned about a year ago, then someone picked it up, added some shady stuff to it and made it proprietary. There's a legal issue involving this one as well, because the original extension was licensed under GPLv3, so the current developers are _required_ to disclose the source code of the most recent version, and they're not doing it.

See the blog post here: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/. This add-in harvests your data. STAY AWAY.

Distributing spyware that collects all browser history.

Spyware. Violates GDPR. Use Stylus instead. https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

This browser extension logs ALL your browser history and sends it to servers for "statistics". These URLs can include authentication tokens, for example: when you click on a password reset link email, or when you visit your social media page with your full name in the URL. Remove the extension, and read more here: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

Tracking user history without asking consent....

spyware

spyware

https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

This add-on is spyware. Stylus replicates its functionality and doesn't steal your browsing history. https://addons.mozilla.org/en-US/firefox/addon/styl-us/

Privacy nonsense

No thanks. I don't need an extension that sniffs my data.