User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 Build ID: 20141125180439 Steps to reproduce: - Add a preference without set description to your extension (since it's optional according to https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/simple-prefs#Optional_Common_Attributes), like the extension I attached. - Install extension - Open extension preference page Actual results: The description of the pref is set to "undefined" instead of being omitted. I initially thought that it was jpm related, however it happens with cfx too. I've looked for a possible cause, and this is the only place the description is set without a check if it is actually a description: https://github.com/mozilla/addon-sdk/blob/master/lib/sdk/preferences/native-options.js#L126. Expected results: The description should not be set.

Comment on attachment 8542976 [details] Pull Request nice work Martin, r+. i left a few nit comments, if you could please address them (and then squash into one commit), that would be great. thanks.

Commits pushed to master at https://github.com/mozilla/addon-sdk https://github.com/mozilla/addon-sdk/commit/bd84fbb0b8929a8f11f6a62bb0e90be504e4689c Bug 1116761: Don't display 'undefined' when no setting description is set https://github.com/mozilla/addon-sdk/commit/af153444ce2533a0e3e4e6a57a483109c3fc5dfb Merge pull request #1791 from freaktechnik/fix-undefined-descriptions Bug 1116761 - Don't display 'undefined' when no setting description is set, r=@zombie