https://hacks.mozilla.org/2017/10/saying-goodbye-to-firebug/
Firebug has been a phenomenal success over its 12-year lifespan. So it’s sad that Firebug is now reaching end-of-life in the Firefox browser, with the release of Firefox Quantum (version 57) soon. The good news is that all the capabilities of Firebug are now present in current Firefox Developer Tools. So the work pioneered by the Firebug community over the last 12 years lives on in Firefox Developer Tools.
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Tomi Engdahl says:
Say also goodbye to more extensions:
Firefox 57: Good news? It’s nippy. Bad news? It’ll also trash your add-ons
Unless you’re lucky and there’s already a WebExtensions equivalent
https://www.theregister.co.uk/2017/11/10/open_source_insider_firefox_57/
Mozilla plans on November 14 to start rolling out Firefox 57, a massive update that just might send many of its users scurrying for the LTS release.
First the good news. Firefox 57 is faster, quite noticeably so, thanks to improvements to what Mozilla calls Project Quantum. Quantum encompasses several smaller projects in order to bring more parallelisation and GPU offloading to Firefox. That’s developer speak for using more of that really fast GPU you’ve got. And again, the results are noticeable (some of them have already rolled out).
Firefox 57, however, marks a major change on another front – extensions.
For a long time Firefox has supported two types of extensions, the traditional legacy ones we’re all used to and the WebExtension variety that work more like what Chrome uses. As of Firefox 57, legacy extensions will no longer work. If you’re lucky, your favourites will already be available as WebExtensions. I happened to be lucky, for the most part.