How to Enable or Disable Skeleton UI in Firefox for Windows 10

If you’re using Firefox as a default browser on your Windows 10 PC, then you might have noticed that it take lots of time in opening, right? Mozilla is working on fixing Firefox this startup experience with Skeleton UI.

Let’s learn about What is Skeleton UI of Firefox. This is a feature that allow Firefox developers to create the first window and populate it with a non-interactive placeholder before they load xul.dll. In laymen’s Skeleton UI is the first thing that you see when you open the Firefox browser. It gives a visual indication (Blank UI) that the browser is opening up. Check out following screenshot of idea:

Firefox Skeleton User Interface

Firefox current startup process (that includes the visual appearance of browser UI and New tab page) takes around 19 seconds or sometimes even more if using on low-end devices.

According to Mozilla, with the implementation of Skeleton UI users can reduce Firefox startup time by 9 seconds. It’s going to be a great addition to Firefox and will improve the user experience for those experience startup issues.

To Enable or Disable Skeleton UI in Firefox

Skeleton UI is already enabled out of the box in Firefox Nightly. There’s a parameter available in the browser Advanced Preference page from where users can easily enable or disable Firefox’s Skeleton UI. Here’s how you can do that:

Make sure, you’re running latest version of Firefox NIghtly.

Next, open a browser and then visit the about:config and hit enter. When the warning page appears, click on the “I accept a risk and continue” button.

Doing this will open Advanced Preference page. Here in the search box type “browser.startup.preXulSkeletonUI“.

Enable and Disable Skeleton UI in Firefox

To Enable Skeleton UI set the preference to True and to Disable Skeleton UI set the preference to False using the Toggle button. To experience how Firefox’s Skeleton UI loads up at startup, restart your browser. Check out gif to learn how it works:

How to Enable or Disable Skeleton UI in Firefox for Windows 10

Have you noticed Firefox browser Skeleton User Interface? How’s the experience, we would like to hear from you in the comments.

Viney Dhiman
Himachali, Mechanical Engineer, Webmaster at Geeker Mag, Follow it on Telegram |

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