Include how to find Firebug
Update general-finding-the-development-tools.md
Firebug and Firefox docking
Update general-dock-the-developer-tools-to-aid-responsive-design.md
Update console-log-info-warn-error.md
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All the other copied this Firebug feature
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Closure Inspector

See https://getfirebug.com/wiki/index.php/Closure_Inspector for images and more details.
Update debugging-watching-values.md
Scratchpad

https://developer.mozilla.org/en-US/docs/Tools/Scratchpad
Update performance-disable-the-browser-cache.md
Update performance-export-the-network-timeline-as-har.md
Update performance-checking-domcontentloaded-and-loadevent.md

Firebug did this first too, no?
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Another Firebug first
Update debugging-xhr-breakpoints.md
Update inspect-navigating-the-dom-with-breadcrumbs.md
Merge pull request #12 from sroussey/master

Start of work on updating secrets for Firebug