Seen while running Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.3a4) Gecko/20100407 MozillaDeveloperPreview/3.7a4 STR: 1. Install the Mozilla Developer Preview Build 2. Search for Chatzilla 3. Try to download it. 4. Receive attached screenshot Since almost all extensions are incompatible with the Dev Preview, we should not get this alert, but rather the alert that the extension is not compatible with the Dev Preview
http://github.com/davedash/amo-js/commit/a9c8d1dc65153c Fixed in zamboni, maybe remora.
Verified FIXED on production.