Created attachment 8903581 [details] searchpanel.png [Affected versions]: - Firefox 56.0 beta 8 [Affected platforms]: - Win 7 32-bit - Ubuntu 16.04 32-bit - Mac OS X 10.9.5 [Steps to reproduce]: 1. Open Firefox with new profile, open a New tab 2. Click on "Fox head" notification button 3. Click on "Customize", click on "Show Customize in Menu" button, enter Customize mode, drag and drop the Search bar from Toolbar under "Additional Tools and Features" section, or in Menu bar. 4 Exit customize 5. Click on search notification then click on "Open One-Click Search" button. [Expected result]: Search panel from toolbar is correctly displayed. - [Actual result]: If the Search bar was moved under "Additional Tools and Features" when clicking on "Open One-Click Search" button, the search panel does not opened. If the Search bar was moved under Menu Panel, the search panel is opened on random places on browser window and the search input field is missing. - [Regression range]: - Not a regression, it also reproduces on Nightly 56.0a1 2017-06-30. [Additional notes]: If menu panel is open and in same time you interact with search, the search panel is open correctly.