Block category menu can have scrollbars in Firefox

[CST1229]

Expected Behavior

In the block category menu, there should be no scrollbar in all situations.

Actual Behavior

On Firefox, there is a scrollbar when there are enough items.

It appears the Scratch Team knows about this issue, but that comment was probably written a long time ago since this now can be fixed in Firefox 64+ by adding scrollbar-width: none; to .blocks :global(.blocklyToolboxDiv) in src/components/blocks/blocks.css. This isn't a fix for all Firefox versions Scratch supports (Firefox 57+), but I don't think a lot of people use Firefox 63- and this is a minor issue anyways.

Steps to Reproduce

1. Open the editor on Firefox
2. Add enough extensions or decrease the browser window size so not every category fits onscreen
3. See the scrollbars

System Details

My browser / operating system: Windows NT 10.0, Firefox 98.0, No Flash version detected

Screenshots