A scroll bar is present when the item being displayed is larger than the space provided by the webpage program.

Check your zoom controls.

<Control> (Mac=<Command>) + (plus) enlarge - (minus) reduce 0 (zero) restore

Zoom in/out didn't really matter. And I'm not quite sure you understood my question. I don't mind the scroll bar, in fact I want it to be there. I just don't want it to be so small (left side attached image) but instead I always want it to be normal size (right side attached image)

You can set these two prefs to false on the about:config page to disable custom scroll bars.

• layout.css.scrollbar-color.enabled = false
• layout.css.scrollbar-width.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

https://developer.mozilla.org/en/Web/CSS/scrollbar-color https://developer.mozilla.org/en/Web/CSS/scrollbar-width

Thanks for your reply. This setting looked like exactly what I needed but I've set both to false and restarted the browser but it doesn't seem to make a difference. At least not on Twitch.tv

That website seem to be disabling the Firefox scroll bar and use a JavaScript library to create its own scroll bars that are shown on hover.

Ah ok. I figure you would've posted a way to disable that if there was some but just to be sure: is there a way to disable that? :P