Hello,

Please see Customize your wallpapers.

Hello

To complement, this discussion.

https://connect.mozilla.org/t5/firefox-labs/custom-wallpapers-are-here-with-firefox-labs-in-138/td-p/95308

https://support.mozilla.org/en-US/questions/1513622

About Studies https://support.mozilla.org/en-US/kb/shield

Let me ask you a question, have you removed the check mark next to Install and run studies. about:studies, you can see your Completed studies

Try again (to see) Allow Firefox to install and run studies

Otherwise.

For information purposes. Configuration Editor for Firefox https://support.mozilla.org/en-US/kb/about-config-editor-firefox Enter a search term browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.enabled Enter a search term browser.newtabpage.activity-stream.newtabWallpapers.customColor.enabled

I have followed the advice offered and I customised my wallpaper. It worked, in a way, as the wallpaper I selected appeared above and behind the wallpaper I chose for Firefox start-up page. I chose a wallpaper from my own images. I can't work out how to change it because it looks wrong.

Hello again,

Could you please clarify, what exactly you have done? Could you please also provide a screenshot of your problem (you said that the wallpaper you had set appeared "above and behind" the Firefox New Tab page wallpaper)?