[Affected versions]: - Nightly 55.0a1 [Affected platforms]: - All [Steps to reproduce]: 1. Launch Nightly with a new profile 2. Re-size the window - the window's width is less than 400 pixels 3. Focus the URL Bar 4. Open a new tab and start typing [Expected result]: - Step 3 - The search suggestions hint should be properly displayed as an animation - Step 4 - the URL drop-down and the hint should be properly displayed [Actual result]: - Step 3 - the hint does not fit the window - Step 4 - the drop-down and the hint are not compacted enough to fit the windows size - For more details, please see the screenshot: https://bug1368437.bmoattachments.org/attachment.cgi?id=8874517