You can restore the classic look in Firefox 89 and disable Proton UI if you are not happy with the user interface changes made in this version of the browser. Luckily it is easy and can be quickly done.
Firefox 89 comes with a new look of the user interface of the browser, known as Proton. It includes a lot of changes to how tabs, menus, the address bar look.
Firefox 89 UI has been heavily modernized and resembles rounder corners of the upcoming Sun Valley update for Windows 10. The tab row look flat, so only the active tab has a highlight around its name. The main menu doesn't have icons for items, with some commands renamed or removed. So, you will not find the Protection Dashboard and Library items. For the Protection Dashboard feature, you have to click on the site info "shield" icon in the address bar. Instead of Library, Firefox directly shows Bookmarks, History, and Downloads right in the menu.
Update: Firefox 91 users, the below method is not for you. Mozilla has changed the browser options, but we have a working solution for you. Do the following:
If you can't stand the new UI in Firefox 89, you can disable it by turning off a couple of options in about:config. Here's how.
Restore Classic Look in Firefox 89 and Disable Proton UI
- Open Firefox and type about:config into the address bar.
- Hit Enter and click on I Accept the risk to proceed.
- In the search box, enter proton.
- To disable Proton UI in Firefox, set the following values to false: browser.proton.enabled, browser.proton.modals.enabled, browser.proton.doorhangers.enabled, browser.proton.contextmenus.enabled.
This will immediately restore the classic appearance of the Firefox browser.
Keep in mind that the Proton UI is still a work in progress. Firefox 89 is just an initial release with this new look. In the near future, more changes will hit stable releases of the browser, with more and more changes to the user interface. Eventually the above mentioned about:config options may stop working, but at the moment of this writing they work like a charm.
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