Table of Contents

• Lepton (old name: Proton Fix)
  • Introduction
  • Installation Guide
  • WHY Proton?
  • WHY Not Proton?
  • Padding Comparisons
  • Contributors
  • FAQ

🔔🔔 Did you set a custom, but not work?

You should copy user.js file before the theme works.

The option system depends on user configuration, and nothing applies without settings.
Also, real-time changes are difficult for technical limitations and require restarts.

Some settings can be conflict and should be explicitly false.

Proton is Firefox’s new design, starting from Firefox 89.
Photon is the old design of Firefox which was used until version 88.

Proton’s overall feel is good, but there were a few things I didn’t like and wanted to improve.
That’s why this project was born, and Lepton to denote light theme layer.

Disclaimer: It works on Firefox 89 and above!!

(Lepton’s design ⬆️)

Script Installation (experimental)

Linux, mac users:

bash -c "$(curl -fsSL https://raw.githubusercontent.com/black7375/Firefox-UI-Fix/master/install.sh)"

Windows users: Run with powershell (Does not work at Win7?)

Powershell -c "Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iwr https://raw.githubusercontent.com/black7375/Firefox-UI-Fix/master/install.ps1 -useb | iex"

Manual Installation

You can see the installation guide with screenshots on the wiki.

1. Download files
   • Click the green “:arrow_down: Code”-button above
   • Select “:package: Download Zip”
2. Find your profile directory
   • Open about:support in a new tab
   • Find the Profile Folder entry and click the Open Folder button
3. Copy downloaded files
   • Extract the downloaded zip file
   • Copy the user.js file to the previously opened profile directory
   • Create a new directory inside your profile directory called chrome
   • Copy the remaining files from the extracted zip-file into previously created the chrome directory
4. Restart Firefox
   • Click the Clear startup cache... at the top of about:support

If you prefer Photon, see Lepton’s photon-style.
If you prefer Proton, see Lepton’s proton-style.

I think a lot has improved.

(Proton’s design ⬆️)

• Neatly organized menu
• Icon beautiful enough to remind you of Edge
• Nice color scheme
• Satisfied Rounding
• Modal window & Scrollbar!!

However, there are also many flaws.

(Photon’s design ⬆️)

• Is it a tab or a button?
• Where are the menu icons?
• Icons in ActivityStream are too small
• Padding gaps are wide
• ⚠️ Address bar 3-point menu, screenshot moves to toolbar (can’t fix)

• Photon (Quantum)
• Proton
• Lepton

Thanks to all contributors to this project for providing help and developing features!

A list of all contributors can be found in CREDITS.

• Black pixels around the selected tab bottom corners
  

Please follow the Installation Guide,
or set about:config’s svg.context-properties.content.enabled to true .

• The closed button and some panel menu icons are not visible.
  

Please follow the Installation Guide,
or copy the icons directory to chrome .

• Less icons in the panel with photon-style
  

  I didn’t put all the icons like before.