Firefox 56 is not compatible with Firebug. This is what I did to make it 
run again:
- uninstall Firefox silent update service by running "C:\Program Files 
(x86)\Mozilla Maintenance Service\uninstall.exe" to prevent automatic 
Firefox updates
- disable automatic updates from preferences: 
https://www.bleepstatic.com/tutorials/browsers/firefox/silent-updates/firefox-update-tab.jpg
- install previous version of Firefox from here: 
https://ftp.mozilla.org/pub/firefox/releases/54.0.1/

Now with Firefox 54 I'm a happy user. Firebug is back again

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