Firefox 88 has quietly removed these features
Firefox Tips and Tools
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How to Use Firefox Web Developer Tools « Tutorials «
Firefox DevTools User Docs — Firefox Source Docs documentation
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File:Mozilla Firefox 1.5.0.12 fi commons-crystal xfce4 therapy raleigh.png - Wikimedia Commons
Firefox Developer Edition
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How to Secure Your Firefox Browser
Access Extension Options From The Tools Menu In Firefox
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How to Secure Your Firefox Browser
Mozilla releases offline machine translation tools
Is there an equivalent of Chrome's DevTools' Sources panel in Firefox DevTools? - Stack Overflow
Firefox 4 show tools menu in button interface - Super User
Firefox Developer Tools
