I've been using Stylish for many years with Firefox to customize the user interface itself. It was very convenient. Unfortunately since FF57 manipulating the user interface is no longer supported via add-ons (have to do it manually through userChrome.css). This is of course not the developer's fault and this is still a very good add-on for what it does, but no longer useful to me I'm afraid. This is why I gave it only 4/5 stars.

Absolute garbage . . . I cannot get any of the, mostly ugly, images to work on my Google home page. The image that I previously had just disappeared . . . good work!

Why do you need to collect data to apply CSS on websites ? :-)

LO

Yep just like everyone else the forced update wiped all my settings. This is unacceptable.

Why no confirm before update?

All custome styles are gone. oh, my god , hope roolback to firefox 55 is usefuly.

Слетели все ручные настройки тем. Приложение работает крайне нестабильно.
Если открываешь страницу в фоновой вкладке, то стиль не применяется. Приходится обновлять страницу по CTRL+F5

Just discovered the last 13-months events of Stylish, so saddening to see a once-great add-on made unusable by an astonishing amount of insanely stupid decisions (de facto closed source, spying features all over the place, feature regression, and no clear communication on any of these points whatsoever) from the new “owner” (how can this notion even stand for an GNU-licensed project anyway?)

I see here and there advices to go back to 2.1.1. Actually you really shouldn’t, considering how much the 2017 despicable flavor of stylish wants to spy on you: https://www.ghacks.net/2017/01/04/major-stylish-add-on-changes-in-regards-to-privacy/

Stick to 2.0.7 instead (and to FF ESR, therefore), last version before this suicidal overhaul…

Update sucks! All custome styles are gone and no hint or help how to get them back working.
stylish once was a great tool for having a quick overview on different servers containing the same web-app.
Now this is gone. Thanks to fu***** Mozilla updates and constantly "improving" of the Firefox.
So now it's time to say ggodby and switch to chrome and using hopefully better addons there.

Seriously the worst update ever, I wish i could go back to the previous version, this is aboslute trash. You removed the ability to edit the actual browsers CSS, but guess what, the one I had got completely fucked up, and i cant go and remove it or edit it. so now im stuck with huge ass tabs and it looks ugly as hell. with no way to fix it, Also i had old styles just sitting there, THE UPDATE ENABLED THEM ALL so i have to go and figure out which one I was currently using as they are all applied fucking up all the sites, seriously WHY FIX SOMETHING IF IT WORKED FINE TO BEGIN WITH you ruined something great good job shit for brains

I couldn't install new themes. I tried multiples, but it didn't work at all.
Also I prefer the previous version of Stylish because it was easier to use and make a new theme.
Now Stylish isn't as good as before.

Tried multiple styles. None of them would install at all. Looks like the extension itself is broken and not the styles.

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