User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:21.0) Gecko/20100101 Firefox/21.0 (Beta/Release) Build ID: 20130512193848 Steps to reproduce: 1: Inspected an item in an inner iframe of the page (Here's an example page, it doesn't matter whether it's inline or linked stylesheet in the inner frame: http://www.quackit.com/html/templates/frames/frames_example_4.html) 2: Clicked the link to open the css where a rule was defined. Actual results: Instead of showing the rule, it only opens the style editor to wherever it was before. I noticed this on both Firefox 21 and 22. Expected results: It should be aware of the frame that was selected, and not fail in this case. (It would also be awesome to have a cd(window.frames[0]) like Firebug, or a frame context selector on the console, like Chrome has.)

Regression window Good: http://hg.mozilla.org/mozilla-central/rev/1b7103181091 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20121130 Firefox/20.0 ID:20121130020812 Bad: http://hg.mozilla.org/mozilla-central/rev/d2fbc67f69f5 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20121130 Firefox/20.0 ID:20121130055213 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=1b7103181091&tochange=d2fbc67f69f5 Regressed by: c77b869c2025 Joe Walker — Bug 788977 - [toolbox] Land the developer tools window; r=harth,jwalker,mikeratcliffe,paul,dão

This regression has shipped since FF20 - no urgency to block a release on it, but will look at a low risk uplift nomination when ready.

This bug doesn't belong to the source editor component.