This is What Firefox's New 'Proton' Redesign Looks Like on Ubuntu - OMG! Ubuntu!

A new look is coming to Mozilla Firefox — yes, another one — and in this post we show you what it currently looks like on Ubuntu, and share detail on how

Changes in Proton Design System:

  • New “hamburger” menu that is purely text-based, no icons, with rejigged entries.
  • New ‘new tab’ page with improved layout and more customization options.
  • New info boxes make Firefox’s in-app notifications more eye-catching.
  • New address bar/tool bar with fewer icons.

Steps to test Firefox’s Proton Design Flags:

  1. Type about:config in a new tab.
  2. Click “Accept the risk and continue”.
  3. Search for “browser.proton.enabled”.
  4. Click the toggle icon to enable the setting.
  5. Add these flags to enable the specific Proton flags:
  • Add browser.proton.enabled to enable Proton.
  • Add browser.proton.tabs.enabled for new tabs.
  • Add browser.proton.appmenu.enabled for new condensed text-based menu.
  • Add browser.proton.urlbar.enabled for the new URL bar.
  • Add browser.proton.toolbar.enabled for the new toolbar.
  • Add browser.proton.contextmenus.enabled for new context menus.
  • Add browser.newtabpage.activity-stream.newNewtabExperience.enabled to get the revamped new tab design search.
  1. Restart Firefox Nightly to make the changes.

You can see the meta bug here to see the progression:

If you want to make a suggestion to the Mozilla engineers to improve Proton, check their Matrix room here:

(thanks to for the suggestion 🤝)

Between this, Fission, and the fact you’ll be able to customize more the home and new tab pages seems like a really exciting year for FF.


And the improvements in the JavaScript engine that they are implementing lately (Warp and Stencil). Have you noticed how much faster it is now compared to Chromium? Amazing…

I love it, even the tabs which seems to be a controversial topic. I’m really happy they’re making a more modern design.


Me too :)

I’d absolutely love everything about this redesign if it wasn’t for the massive tab bar. Have been using compact mode ever since I started using FF, and it’s sad to see how unnecessarily thick it is.


If I’m honest with you, now with Proton, I think they’ve improved enough and now it’s not as rough as it used to be :')

looks great in GNOME!


Yes! I can’t wait to see the final design! :D


For once i like it AND… it doesn’t work on Ubuntu Wayland for the Raspberry Pi 4, only on Xorg.

And let’s see if the performance improvements are good enough as to make Firefox and actual usable browser for the Raspberry Pi 4, i would be more than happy to move from Chromium if all conditions are met.

Amazing post and thank you for informing us!

I’d like to ask if you can edit the post and add browser.proton.enabled, because that one is part of the redesign, and you seem to have missed it. Also it would be nice if you can mention that this should be configured in about:config.


Oh, you’re right! Thanks for letting me know! <3

I hate it, lol

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