You can see "Error dispatching: getProperties" in console upon value "expand" attempt instead. I'd like to commit couple of drive-by fixes with this: 1) Use Object.getOwnPropertyNames in getProperties (as already used in completion) 2) Artificially append __proto__ property in case getting only own properties in order to allow further values browsing.
Created attachment 48719 [details] [PATCH] Proposed fix.
Committing to http://svn.webkit.org/repository/webkit/trunk ... M LayoutTests/ChangeLog M LayoutTests/inspector/console-dir-expected.txt M LayoutTests/inspector/console-dir.html M WebCore/ChangeLog M WebCore/inspector/front-end/InjectedScript.js M WebCore/inspector/front-end/ObjectPropertiesSection.js M WebCore/inspector/front-end/Section.js M WebCore/inspector/front-end/inspector.css Committed r54769