It would be very useful to have a search by chrome://something. Sometimes it's not that easy to find the right file. It is related to bug 121928.
For what it's worth, usually the filename is unique enough that only searching for the leaf name (i.e. browser.js from chrome://browser/content/browser.js) works pretty well.
Right! There is also another workaround that works pretty well: 1. open the URL in Firefox 2. copy-paste some line of that file into dxr/mxr
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