Mozilla Firefox is getting another design refresh; Mozilla has been working on a refresh of the web browser's design under the Proton codename for some time.
The organization plans to launch the new design in Firefox 89 Stable, out on May 18, 2021. Firefox Stable is at version 87 currently, which means that there will be only one major stable version release before the new design release in May. While things may be delayed, it seems unlikely that this is going to be the case for the design refresh.
Our last preview of Proton dates back to February 2021; a lot has changed since then. Most design changes can be checked out in Firefox Nightly only, which is at version 89. Many are hidden behind flags and not necessarily enabled by default.
The compact density is still available in the latest Nightly version.
Mozilla removed the preferences browser.proton.toolbar.enabled and browser.proton.tabs.enabled in the latest Nightly versions. The functionality is included in the main Proton preference browser.proton.enabled.
Quite a few new preferences have been added to Firefox in the meantime that handle various Proton related features.
Here is an overview of the preferences that are available currently:
Generally speaking: most preferences are Boolean and accept values of True or False. True enables the new design usually, False disables it; this is true for all preferences that end with "enabled".
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