User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 6.0; rv:2.0) Gecko/20100101 Firefox/4.0 After adding a page as a bookmark, I noticed that the navigation toolbar was larger than it was before. NOTE: THE WEB PAGE IS NOT AFFECTED. ONLY THE NAVIGATION TOOLBAR IS STRETCHED. I open a new tab, and realize that it isn't a page-specific issue; it pursues all throughout my browsing in the window. I open a new Firefox window, and the bar is back to normal, until I click on the bookmark star from the awesome bar. I then opened another new window, tried the control-D (add page as bookmark) shortcut and the bookmark manager method of adding and removing a bookmark; it happens again. Reproducible: Always Steps to Reproduce: 1. Click the add bookmark star from Awesome bar in new window. 2. Control-D keyboard shortcut in new window. 3. Click 'bookmark this page' in Bookmark Manager, in new window. NOTE: bug can only be reproduced in a new window. Actual Results: The navigation toolbar stretched again. Expected Results: The toolbar would NOT stretch. XMarks browser extension installed. Bookmark toolbar enabled. Tried again without it, and the bug persisted.

Does NOT reproduce in safe mode (with add-ons disabled). My gut feeling tells me its Xmarks...

New window. Went to Options>toolbar layout. clicked use small icons, and reclicked (to disable). Tried reproducing the bug, and was unsuccessful. Strange...