Making the right edge of Firefox wider?

Factual Questions
1

The slide bar is really narrow and shrinks even further if the cursor is not hovering. Seems like it used to be wider.

2

It’s not doing it on mine, so I can’t test this, but supposedly you can fix it in about:config:

  1. Type about:config into your address bar and press enter.
  2. If necessary, click to say you’ll “Accept the Risk”.
  3. search for the this setting: layout.css.scrollbar-width-thin.disabled and toggle it to true.

You may or may not then need to restart Firefox.

3

You can also set widget.non-native-theme.scrollbar.style there to make it mimic different operating systems’ scrollbar styles:

0 is the default value for your computer
1 is macOS
2 is Linux
3 is Android
4 is Windows 10
5 is Windows 11

Setting it to 4 makes it look like Windows 10, which should be wider than most modern defaults:

And if that’s still not wide enough, you can set widget.non-native-theme.scrollbar.size.override to something absurd, like 50, to make it super wide:

That link has more details (again: How to enable wide scrollbars on Firefox · WesleyBranton/Custom-Scrollbar Wiki · GitHub)

4

That didn’t work, in fact I had no scrollbar at all.

5

This didn’t seem to work either. In Control Panel I set scrollbar to Always On and that did work and is now a wider bar as well. Maybe I had to restart one more time or something.

6

Great. Glad it worked.