Reproducible on: Firefox 31 beta 2 - 20140616143923 Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0 latest Aurora 32.0a2 - Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 latest Nightly 33.0a1 - 20140617030203 Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 Steps to reproduce: 1. Run Firefox for the first time (or simply remove the profiles folder: On Windows - %appdata%\Mozilla; On Mac - Library\Application Support\Firefox; On Linux - /home/user/.mozilla) -> "Import Settings and Data" window should appear 2. Select Chrome browser to import data from in the "Import Settings and Data" window and then press "Next" 3. Click "Finish" on the window saying "The following items were successfully imported: Cookies, Browsing History, Bookmarks etc" Expected results: Firefox should start having all the Chrome settings and data imported Actual results: History is not always imported from Chrome (in very few cases history was added). In browser console: [Exception... "Component returned failure code: 0x80630001 (NS_ERROR_STORAGE_BUSY) [mozIStorageService.openUnsharedDatabase]" nsresult: "0x80630001 (NS_ERROR_STORAGE_BUSY)" location: "JS frame :: resource://app/components/ChromeProfileMigrator.js :: GetHistoryResource/<.migrate :: line 229" data: no] MigrationUtils.jsm:247 some history did not successfully migrate. Notes: 1. Reproducible on Win 8.1 64-bit, Ubuntu 12.10 32-bit, Mac OSX 10.8 2. The issue reproduces back to Firefox 11 when Chrome was introduced as an importing browser, so it's not a regression 3. The issue reproduces with the same error in the console when data is imported using Library -> Import and Backup -> Import Data from Another Browser 4. History option is not highlighted in the Import Wizard window: https://docs.google.com/file/d/0B7jBNZBM3mz-OWQzcWNhTlY0Tm8/

Hello and thanks for testing migrators. Was Chrome running when it failed? If so, this sounds like a dupe of bug 706005.

Thanks Matthew! Chrome was indeed running while I performed the tests. I retested under Win 8.1 and Mac OSX and history is added when Chrome is closed. I searched for a dupe of this bug, but probably I was using the wrong summary, thanks for pointing bug 706005.