Created attachment 8761549 [details] bookmark_folder-issue.png User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0 Build ID 20160608030219 [Affected versions]: Nightly 50.0a1, Build ID: 20160608030219 Firefox 46 [Steps to reproduce]: 1. Open Nightly with a new profile and go to any page. 2. From the toolbar click the star-shaped button to bookmark the page. 3. From the panel that opens, click on "Folder" drop-down. 4. Click "Choose" folder. 5. Click "New Folder" button to add a new folder. 6. Enter a name for the folder. 7. Click on other folder (e.g. Other bookmarks). 8. Repeat steps 5-7 for a few times. [Expected Results]: Each time a new folder is created. [Actual Results]: After a few new created folders, the input that contains the name for the folder "detaches" and remains on top of other folders. Also the folder is not created. (See attached screenshot). I will attach a video for better understanding. [Regression range]: I'll investigate if this is a regression. [Notes]: Reproduces with e10s activated and deactivated.
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