I´ve read in the stylish forum that "As far as we know, no WebExtensions-based extension can restyle the browser user interface, only web pages. To restyle the interface, a userChrome.css file will be required. http://kb.mozillazine.org/UserChrome.css" https://forum.userstyles.org/discussion/58456/firefox-version-for-57-and-beyond.
If this is so, all the topics that modified the interface of mozilla and that can not be recovered from the previous version are not really useful at all?

Stylish was a great add-on, but become completely broken after update. Styles are gone, creating new styles not working. Best update ever!

Sigh. I've tried and tried and tried, and I CANNOT add any new styles with your new "improved" version for firefox, nor can I import my old ones.

As another use posted here.."It also will not save my styles when I try to manually import them--the save button does nothing at all. I can't even install new styles from userstyles.org--it just takes me to the addon installation ..."

Reading all of these comments, is just pathetic. Thanks for saving my old styles, unfortunately, you provide no way to add them, either by import or manually adding them as new.

terrible.

My two pages of browser chrome customizations are gone after the latest update.

Look, I understand it's no longer possible in Firefox 57, but if you hadn't just erased them, I could have placed them into userChrome.css manually...

First time user, trying to add this after Firefox upgrade to 57.0. Install repeatedly fails with Database error. Online help only references Chrome, not Firefox, and Chrome help does not contain enough context to find correlated issues in Firefox.
Gave it up, installed Stylus Beta instead, which installed and worked perfectly the first time. Clearly this was not adequately tested.
See you, bye ...

"An error has occurred using the Stylish database. Would you like to visit a web page with possible solutions?"
I can't use this extension.

EDIT
Even if Firefox 48+ is technically capable of running WebExtensions, it is deeply wrong to force v3.x on users of Firefox 52 ESR, Basilisk or Waterfox knowingly robbing them many great features in advance.

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Please make the WebExtension version exclusively available for Firefox 57+. Change Geckos minVer for that.
All users of Firefox 52ESR or Firefox forks like Waterfox, Cyberfox, Basilisk etc. do not need the feature reduced WebExtension version to be installed automatically.

Josh

Sehr schade. Die Verwaltbarkeit eigener Styles ist erschwert, da sie nicht mehr über die Addon-Leiste gelistet werden (vermutlich wegen der neuen Webextensions erforderlich).

Ganz übel aber: Das eigene CSS wird erst dann auf einer Seite aktiv, wenn sie fertig geladen ist! Das ist absolut uncool und verleidet alles. Seiten, die im Laufe ihrer (wegen träger Werbung manchmal sehr langen) Ladezeit noch mehr herumzappeln, die Größe oder Position von Elementen ändern, so daß der Text ständig springt - fürchterlich!!!
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Extremely annoying: the custom CSS is applied only when a page is completely loaded. That leads to even more jiggling of the content. Horrible!