After downloading of the nighty bulit version, it is not possible to open the developer tools for debugging
Things work fine for me on ToT. Could you please provide a build number and scenario?
WebKit r78038 The developer Tools never starts. It doesn't matter which html-file you choose;
Created attachment 82146 [details] [IMAGE] Screenshot. Things work fine for me. We might have touched preferences. Could you try opening it using shortcut (Cmd+Option+I)? Maybe it is docked and too thin in the bottom of the screen?
This functions, only the drop-down menu start debugging javascript doesn't function
Got it.
Created attachment 82166 [details] Patch
Comment on attachment 82166 [details] Patch lgtm
Comment on attachment 82166 [details] Patch Clearing flags on attachment: 82166 Committed r78470: <http://trac.webkit.org/changeset/78470>
All reviewed patches have been landed. Closing bug.