Great. The latest version breaks everything, and the developer doesn't even offer a version history so I could go back to an earlier version. Then I read the reviews and realize it became spyware at some point.

This is still spyware. Use either an OLD version from the original author (2.0.7 works fine) or Stylem created for Pale Moon and Basilisk, and based off Stylish 2.07, works fine on Fx 52.9 ESR and probably on other versions as well. Stylus is NOT a good choice since a main reason for using this extension is so one can modify the UI and you cannot do that with Stylus but you can with Stylem.

Found a way to reinstall itself and show a popup asking for permission to do data collection.

This addon is pure spyware now and should be removed from the store permanently. I don't know what Mozilla was thinking letting them back.

eu abaixei o firefox mais n da

Oh god, you brought it back? Single purpose extensions should NOT collect ANY user data.

Mozilla STOP indulge spyware like STEALish!

As said before. It collects your data in the really sneaky way. It was banned from AMO for some time.
Really sad that it returned here (guess because of updated description that now mentions that our data is collected).

Once a great extension, now spyware. Use "Stylus" instead.

I uninstalled this app when they started collecting all your information without disclosure and selling it, then they are finding ways to reinstall this addon without your permission. Please remove this addon from Firefox, it's on the level of malware now.

Who removes every single older version of their addon from addons.mozilla.org? A douche bag, that's who.

It is Spyware, steals user data and all history of visited URLs. More info: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

Use safe Stylus add-on instead!

Don't use it: changed owners, can no longer be trusted. Switch to Stylus instead.

DO NOT INSTALL - version 3.1.5 is still SPYWARE that records personal information from all visited website.
Good alternative: https://addons.mozilla.org/en-US/firefox/addon/styl-us/

為何舊版本全部刪除？我想下載早期原作者開發的版本

SPYWARE, DO NOT INSTALL IT

Spyware