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.

privacy issues

Privacy concerns

Stay away from this extension. Stylish collects EVERYTHING the user does and sends it to their servers. See https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/ for a breakdown and more information. This add-on needs to be pulled as soon as possible!

Stylish collects and transmits all your browsing behavior over the internet in order to analyze and sell this data. Have a look at 'Stylus' which is a fork of stylish without the invasive privacy infringements.

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

According to this:
https://www.bleepingcomputer.com/news/software/2-million-users-impacted-by-new-data-collection-policy-in-stylish-browser-add-on/
https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/
https://www.ghacks.net/2017/05/16/stylus-is-a-stylish-fork-without-analytics/

this plugin tracks your internet traffic. This cannot be tolerated

According to this article the Stylish browser extension violates your privacy by sending your browser history to foreign servers

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

This cannot be tolerated and breaks trust. No more Stylish for me.

Spyware!. Records every keystroke, every website visited, and sends it to their server: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

For all those complaining that Stylish stopped working on FF 61: Mozilla (again) broke up things. "-moz-document" (which never left the "experimental" status) is now blocked to work on remote URL, i.e., it's useless now. Just remove the "-moz-document" lines from the scripts and they will start working again. About the URL restrictions, now Stylish requires the addresses to be input in a specific field on the bottom of the script editing Page. Of course, incorporating "-moz-document" in the script was much easier, dozens of domains could be filtered at once. Now, they have to be entered one by one. On the plus side, Stylish still has the same flexibility regarding domain definitions, including regex rules! On the plus-plus side, it doesn't depend on Mozilla's moods anymore...

Here's the solution to FF 61.0.
https://stackoverflow.com/questions/51101566/unknown-rule-moz-document-for-stylish-in-firefox-61

Not working in Firefox 61.0