Scrollbar Color Change in Firefox

Scrollbar color change in Firefox

Changing the scrollbar color in Firefox is not as trivial as it is in Internet Explorer and Opera. Firefox only allows the style of the scrollbar to be set by the theme. This is a good thing. Lots of users don't like having the look and feel of interface widgets randomly changed at the whim of a designer. Changing the look of interface pieces can be even more of a problem for visually impaired visitors who may be using a high contrast theme.

That said, if the scrollbar is contained within a <div> in your page, you can create a custom scrollbar and make it functional using JavaScript. This jQuery plugin looks like it would do the trick pretty nicely: http://jscrollpane.kelvinluck.com/

I think this is more or less what you want to do: http://martinsmucker.com/demo/scroller.html

Here's how it works:

Inside the document's <head>, we have to reference several stylesheets and scripts (which you've probably already downloaded from http://jscrollpane.kelvinluck.com/.

This is where a vast majority of the magic happens:

<!-- Styles -->
<link rel="stylesheet" type="text/css" href="jquery.jscrollpane.css" />
<style type="text/css">
    html, body {
        height: 100%;
        margin: 0;
        padding:0;
    }
    #container {
        height:100%;
        width:100%;
        margin: 0;
        padding:0;
        overflow: auto;
    }
</style>

<!-- Scripts -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="jquery.mousewheel.js"></script>
<script type="text/javascript" src="jquery.jscrollpane.min.js"></script>
<script type="text/javascript">
    $(document).ready(function() {
        $('.scroll-pane').jScrollPane();
    });
</script>

This assumes that the css and js files are located in the same directory as your html file. We start by linking to the provided stylesheet.

Then, add a bit of CSS to prevent the normal scrollbars from showing. Set the margin and padding of html and body to 0, and set the height to 100%. All of our content will be wrapped in a div with an id of "container". This container fills the page exactly (height: 100%; width:100%;) and it steals the scrolling so that we can customize the scrollbar (overflow: auto;).

Then we reference all of the appropriate scripts. Here I'm using the copy of jQuery hosted by Google, and again I'm assuming that all of the local scripts are in the same directory as the html file. The last little bit of jquery finds all of the divs with the "scroll-pane" class and adds the appropriate elements and scroll functionality to them.

The html is then very simple.

<body>
    <div class="scroll-pane" id="container">
    All of your content for the page goes here.
    </div>
</body>

If you've done everything right, your page should look like my example.

Custom CSS Scrollbar for Firefox

As of late 2018, there is now limited customization available in Firefox!

See these answers:

https://stackoverflow.com/a/54101063/405015
https://stackoverflow.com/a/53739309/405015

And this for background info: https://bugzilla.mozilla.org/show_bug.cgi?id=1460109

~~There's no Firefox equivalent to ::-webkit-scrollbar and friends.~~

~~You'll have to stick with JavaScript.~~

Plenty of people would like this feature, see: https://bugzilla.mozilla.org/show_bug.cgi?id=77790

As far as JavaScript replacements go, you can try:

https://github.com/mdbootstrap/perfect-scrollbar
https://github.com/Grsmto/simplebar
https://github.com/vitch/jScrollPane

How to change the scroll bar color in Firefox(Specific)?

Not all browsers will let you control the styling for their scrollbars.

You can fake scroll bars with plugins like this, which claims to be cross-browser compatible:

http://www.kelvinluck.com/projects/jscrollpane-custom-cross-browser-scrollbars/

Styling scroll bar on Firefox. How to get rid of black border/outline on scroll bar?

I experienced the same thing and inspired by your comment, I did some more digging.

This appears to be a bug within Firefox. Screenshots are attached to that bug showing a similar black outline around the scrollbar as you experienced when setting scrollbar-color. It appears like it's an issue on Windows Firefox only.

A fix was pushed and appears to be slated to be released in Firefox 85.

There was a comment containing a workaround: "If you set widget.disable-native-theme-for-content=true in about:config and refresh" that the OP said fixed it, but if your app is public-facing will not be much help. I tried this workaround for my site and it did not work perfectly, it removed the black outline but added a few colored pixels at the top and bottom of the scrollbar (I believe it's related to up/down buttons which are hidden by scrollbar-width: thin)

Another workaround is to not set scrollbar-color and the black outline should go away, although that is not the ideal solution when Chrome works correctly when changing scrollbar color to match the theme of your site.

Scrollbar Color Change in Firefox