Well I can no longer edit the about:newtab page, presumably because the WebExtensions API doesn't allow one to modify said page. This is a major flaw as the default newtab page is hideous and retina-burning bright.

Doesn´t work with Firefox ESR 52.4.0. :(

I do NOT like the new version. It will NOT install themes nor customize. I had to go back to the previous version.
After going back the previous version. When I start my computer it updates and it doesn't work. Everytime I start my computer it updates.

Last update broke it badly. Worthless now.

Still broken with ESR 52.4.1 (64 bit).
Blank menu and only Chrome offered if you follow the link that appears when the Stylish icon is clicked.

The change to version 3 of this great extension is horrible. I — like many power-users — have a lot of custom themes, including a theme for the Firefox chrome (rather than a standard Firefox theme) and all of that simply broke.

Sure, I might be able to manually do the work to get things back to how I like it, but that is a ton of work just to get things back to normal again. NOT WORTH IT.

I plan on sticking with Stylish 2 and Firefox 52.4.0 ESR for the foreseeable future. I am really not a fan of this WebExtensions API change. We use Firefox because it does exactly what we want and gives us a lot of power and control over our web browsing experience. Please don't make more work for us by breaking custom-built themes.

Sadly can no longer use. I'm no longer allowing any extensions to access all data for all my websites. I understand needing access to the code to display the page, but I don't understand you needing my passwords and login names. Is there anything you can do to close that security gap? Thank you very much...D

WTF with this shit, I upgrade and all my styles are gone ..
Then, when I copy the saved styles and then edit them, they are no longer compatible, yellow warning symbols appear, what fuck you did ???? OMG ...
In the HP you only have a styles for Chrome, I don't need styles for it, just for FF OKAy !!! I had to go back to the previous version ...

P.S. Don't install the update

cool

After installing 3.0.1, all previous styles disappeared. Re-installed 2.1.1 and hey presto everything was working again.

After the re-release of the overhauled version, I cannot get this extension to work. It breaks core Firefox functionality (trying to customize icon positions, etc. does not work--Firefox goes into an unusable state if I try). 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 page here on AMO.

New UI is a major step back from the simplicity and functionality of v2. The beautified dual panes make it hard to find a style quickly because of the large thumbnails forcing you to scroll through a limited sized area, the Library pane is quite useless. The sectioned code editor creates more work for you.

I was shocked, after the update all gone. Share to find ways:
The key is the stylish.sqlite file. Use tools to manually import according to the situation after opening

Updated itself to a version incompatible with previous storage method.
The only way to restore all my styles was to re-create each one and copy it by hand. Ridiculous.
Luckily I've found an export script (ExE-Boss/export-from-stylish.py) that allowed me to import everything to another user-style manager.

Bonjour,

Cette nouvelle version a supprimé tous mes styles, sans prévenir. Et maintenant, impossible de les récupérer (je précise que ne les ai jamais publié sur le site https://userstyles.org/).

Du coup, je désactive les mises à jour automatiques !

Dommage, sans ça, j'aurai mis au moins 4 étoiles.

The newest update is full of errors. Stylish stopped working for me. Already tried reinstalling it.

La mise à jour 3.0.1 ne reconnaît pas about:home et about:new-page

This add-on stopped functioning last week, but without any changes in FF version. Clicking on the "S" icon (to edit/create a style) elicits an error message that an "error has occurred using the Stylish database". Old styles saved are not found. A NEW style pasted and saved is not found. The developer's repeated comments here on Mozilla.org about a "new version" are not helpful; I am using the current version. (Stylish 3.01 on FF 56 on Mac OS 10.12) This problem was reported on the developer's forum, but has not been resolved. RECOMMENDATION: avoid this add-on.

I was running version 2.11 I upgraded to ver3 and when I click on stylish preferences I get this error:

An error as occurred using the Stylish database. Would you like to visit a web page with possible solutions?

This is the page I get taken to: https://userstyles.org/help/db_chrome

The page I get taken to shows how to fix a problem with Stylish in the Chrome browser. I am using Firefox v56 on ubuntu. I say to myself, ok I am not using any custom Stylish pages so I will just uninstall Stylish and install Stylish ver3 from scratch. I install the latest Stylish version and I still get the above error when going into preferences. So I google fixing Stylish database in firefox and go to this page:

https://userstyles.org/help/db

It says to remove the stylish.sqlite file which I find under my firefox profile folder, so I uninstall Stylish from firefox, delete the stylish.sqlite file and re-install Stylish. I STILL get the error above and I don't see any stylish.sqlite file under my firefox folder. So the latest version of Stylish is unusable for me. I am going back to V2.11.