Reproducible on Firefox 28 beta 1 build 2 (Build ID:20140205162153) Mozilla/5.0 (Windows NT 6.2; rv:28.0) Gecko/20100101 Firefox/28.0 STR: 1. Launch Firefox. 2. Perform a download (ex: an item from google drive). 3. Click Download manager button. Expected result: Download panel is displayed. Actual result: Download panel is not displayed. Notes: 1. Reproduced on the following localized builds: - bg: on Windows 8 32bit - ru and th: on Ubuntu 13.10 32bit - gu-IN, xh and it: on Windows 8.1 32bit - en-US: on Windows 8 32bit and Windows 8.1 32bit 2. In a new window, Download panel is displayed. 3. No errors in console. 4. Reproducible with Firefox 28 beta 1 build 1. 5. Not reproducible with Firefox 27 RC - it's a recent regression. I will investigate further tomorrow.
After more investigations, I was able to reproduce this issue on Firefox 27 RC too. It's highly intermittent and couldn't find a reliable regression window. It's also reproducible with Firefox 18 (when Download manager button is first visible). Please let me know how can I help further on.
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