The most popular and powerful web development tool.
Firebug caught people’s attention — and more than a million loyal fans still use it today.
So it’s sad that Firebug is now reaching end-of-life in the Firefox browser, with the release of Firefox Quantum (version 57) next month. The good news is that all the capabilities of Firebug are now present in current Firefox Developer Tools.
... read the whole story at hacks.mozilla.org.