Not usefull at all.

What is this nonsense 'An error has occurred using the Stylish database. Would you like to visit a web page with possible solutions?.. Why cant I use this add on???

Garbage

Version 3.03 is just another waste of time.
Last working version is 2.1.1.
Just rubbish now.

Since v.3 it became absolutely unusable. Stylus extension made me happy again.

Was working well before. Now, it is impossible to save styles => extension became useless.

doenst work in Firefox 56, add theme ever redirect to addon page.

How the fuck do you actually add a skin, I keep getting taken to the same screen telling me to install stylish add on which is installed

Doesn't work

Firefox 52.6.0 (32-bit) and Basilisk 2018.02.14 (32-bit) broken compatibility. Please help!

menuda mierda que no se instala ningun tema....

Owned by Simularweb; an analytic user tracking company. Sends "anonymous" data unless you opt out. They're not shy about using the addon and website for "conducting business"; marketing analysis, and aggregated data analysis with owned affiliates. The data is kept indefinitely. You know the saying "If it's free, you're the product"

The data sent back to mothership if you dont opt out includes
* Installed user styles count
* Visited web pages
* Installed styles for visited webpages

You can opt out by unticking "Send anonymous data..."

https://www.bleepingcomputer.com/news/software/2-million-users-impacted-by-new-data-collection-policy-in-stylish-browser-add-on/

They own stylish.org; the central hub for user styles, which is pretty much unavoidable.

I've been using this addon for years and I feel cheated. The new behavior doesn't really affect the addon's usefulness but It's the principle of it. I never signed up for this. The current owner Justin Hindman is a sellout... if you care about your privacy. Uninstall or use version 2.0.7 (2016) that hasn't been tainted with tracking nonsense.

Firefox 57+ users I highly recommend using Stylus instead (https://addons.mozilla.org/en-US/firefox/addon/styl-us/). Its functionally similarly and its privacy policy is simple: they don't track you and they don't find you that interesting.

Another one bites the dust.

Buggy. Support is not helpful. The source code of version 3 is not open, so it's not GNU.

Will use Stylus: https://addons.mozilla.org/en-US/firefox/addon/styl-us/

It won't work, and it keeps taking me to chrome repair when i am using firefox.

Useless with Quantum Firefox

Another excellent extension made totally worthless by quantum firefox upgrade.

good grief! talk about how to take a simple plugin and absolutely destroy it. i used this all the time. now? it's a !@#$ expedition to firgure out how to write new styles for a page. how the hell do you screw up something so simple as 'write new rule' from the menu popup? godawful transition to the new version. utterly useless to me now.

new version Stylish for Firefox 57+ is HORRIBLE... similliar like same Firefox 57

Before webextensions, Stylish for Firefox was awesome. Sytylish for Chrome always sucked compared to Firefox's Stylish and now, since webextensions, Firefox Stylish is just as bad as Chrome Stylish. Webextensions is KILLING Firefox! The so-called "speed increase" isn't there and does NOT justify the GUTTING of Firefox extension functionality!

Firefox Stylish can no longer do real-time CSS updating (must reload/refresh web page EACH and EVERY time!), editing in a window (vs. tab only), and its import feature can only handle so many subsections before it just stops adding them and you must add them manually). Those are my biggest gripes about the webextensions Firefox Stylish, I can no longer continue to use it or Firefox 57+ until this functionality is restored and Mozilla wakes the hell up and realizes webextensions are stupid.