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.

6. Restart Firefox Nightly to make the changes.

You can see the meta bug here to see the progression: https://bugzilla.mozilla.org/show_bug.cgi?id=proton

If you want to make a suggestion to the Mozilla engineers to improve Proton, check their Matrix room here: https://matrix.to/#/#proton:mozilla.org?via=mozilla.org&via=matrix.org&via=fairydust.space

(thanks to @TheEvilSkeleton@lemmy.ca for the suggestion 🤝)