Content scripts and snippets could well be put into the same view as other sources.
Created attachment 173296 [details] screenshot
Created attachment 173629 [details] Patch
Comment on attachment 173629 [details] Patch Attachment 173629 [details] did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/14810648 New failing tests: inspector/debugger/scripts-sorting.html inspector/debugger/scripts-file-selector.html inspector/debugger/script-snippet-model.html inspector/debugger/scripts-panel.html
Comment on attachment 173629 [details] Patch Attachment 173629 [details] did not pass mac-ews (mac): Output: http://queues.webkit.org/results/14821375 New failing tests: inspector/debugger/scripts-sorting.html inspector/debugger/scripts-file-selector.html inspector/debugger/script-snippet-model.html inspector/debugger/scripts-panel.html
It looks like we could find some better use of that blank toolbar.
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.