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It's mostly JavaScript. Take a look at https://wiki.mozilla.org/DevTools/GetInvolved https://wiki.mozilla.org/DevTools/GetInvolved and https://wiki.mozilla.org

by bgrins 13y ago

It's mostly JavaScript. Take a look at https://wiki.mozilla.org/DevTools/GetInvolved https://wiki.mozilla.org/DevTools/GetInvolved and https://wiki.mozilla.org/DevTools/Hacking https://wiki.mozilla.org/DevTools/Hacking for more information