Great extension on Chrome... I have yet to give it a thorough run thru on my new Brave browser. However, in Opera GX, there is a minor bug I came across... I had the following option turned on in the browser settings that broke the appearance of the popup from the icon (white text on white background): "Force dark pages Beta" in Opera GX's "Features" section of the main settings area. Turning this setting off fixes the appearance issue. It is a beta feature in Opera GX, but something to be aware of.

Thank you

Poipoi555, your not giving much information by just saying "doesn't work", as I have it installed in Opera version: 73.0.3856.344 (64 bit), it works fine.

...but, here is some information to help everyone understand the use of extensions.

Conflicts with Other Extensions?
If you have other extensions installed, deactivate them and check them one by one to see if any one of them interferes with Stylus.

Some Web Pages block Stylus
Some web pages may conflict with, or block Stylus since Stylus is a script itself for it to work. There was one time I had to deactivate Stylus because the web page conflicted with it. Nothing can be done about this. All you can do in this case is work the best with it.

Built-in Browser Pages
Stylus will not work in built-in pages of Opera such as the Speed Dial page or a default Tab page. Most extensions that affect web pages will not work in browser built-in pages.

If this is the case, click on the Stylus icon on the browser top bar and you will see this:

Stylus doesn't work on pages like this.
As a security precaution, the browser prohibits extensions from affecting its built-in pages (like chrome://version, the standard new tab page as of Chrome 61, about:addons, and so on) as well as other extensions' pages. Each browser also restricts access to its own extensions gallery (like Chrome Web Store or AMO).

Hope that helps.

I used it:
Current tab - works fine
Opened a new tab -works fine.
Opened New Window - works fine
Closed Opera & tabs, reopened Opera with new default tab -works fine.

InCognito Mode
By default, most extensions won't work in Incognito mode, you have to change the settings for that extension for it to work.

Developer Inspection Window
This is when you right click any part of the webpage and click "inspect element". In the inspection window, you can change any part of the webpage. These changes will never remain on page refresh or new Tab or reopening Opera.

What the inspection window also does, it seems to bypass Stylus. I think because the DOM is affected or temporarily changed by the inspection window, and this affect remains so long as that page remains open. Once it is refreshed, renewed or Opera closed and reopens, Stylus works again.

Saving a CSS Style
I list this out for the benefit of new users to Stylus

• Click icon
• Click "manage" button
• Click "Write New Style" button for a new style (left window) or click a current saved style in the middle window
• Write the new CSS Style. It must be correct in syntax, else it won't work.
• Click save button left window, make sure the "enabled" box is checked and for real time results, check "live preview".
• Use the browsers back button to return to the main list.

Hope that helps, along with what I said above.

Doesn't work properly anymore.

I still use this extension in the current versions of FireFox, Google Chrome and Opera. It works fine.

If anyone has a problem, then shut off all the other extensions you are using and see what other extension or plugin is causing the conflict.

Note: this extension will not work on any built-in default page templates used by Chrome, Firefox or Opera. These are the "New Tab" built-in default pages that show quickstart icons. The reason is how those built-in pages work and how they are generated by the browser.

Of course, you need to know CSS coding and know how to use the source code inspector provided by any major browser.

As far as the UI, we're aware there's room for improvement. There's redesigns for various aspects of the UI which will eventually see the light of day. No guarantee you'll like those either. Bear in mind, the UI is completely user-stylable, so you can pretty much redesign it to look however you want.

Stylus is maintained by a small group of former Stylish users who forked the original project when it was converted into spyware. We work on it in our spare time, and mainly focus on fixing bugs, improving existing functionality, and occasionally adding new features.