Hello, Every time I close and reopen Firefox, the new tab and downloads buttons relocate to the far left of the tabs bar. This can be fixed temporarily by customizing the toolbar but the icons move back when Firefox is closed and reloaded. Prior to this issue, I had installed a custom theme by Mozilla and have since removed it, but this hasn't fixed the issue. Additionally, I was watching a YouTube video in full screen mode and, when I left full screen mode, all of my bookmarks, the home button, the new tab, downloads, and nearly every other button in the area were gone. I was able to fix this by customizing the toolbar, but ever since then, the new tab and downloads buttons have migrated. The video I was watching was fairly long so I'm not sure what caused the mass exodus of buttons or exactly when it happened. Is there anyway to make the buttons stay put? Thank you.