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TheBv / Firefox CSS.md
Last active October 20, 2025 15:14
Firefox CSS customization: Resources and an example to fix vertical tab gripes

Introduction

After Firefox recently allowed for vertical tabs to be used I wanted to try it out but had two major gripes:

  1. Grabbing the window to move it to another screen won't work if you click above any interactable element
  2. The sound/playback icons on the tabs are too large making it diffcult to switch tabs when enabled

I've since then found out about being able to customize the underlying HTML firefox uses.

Resources

How do I enable custom stlye CSS for Firefox?