developer edition Bookmarks toolbar a blank space

[zeromake]

 tab right new tab button is disappear

[Soleng]

One guy found the solution :
https://connect.mozilla.org/t5/discussions/update-bug-in-firefox-132-0beta-quot-bookmarks-toolbar-qu... 

you can reset the ui by clear the browser.uiCustomization.state in about:config, next you need restart firefox