Why got Firebug removed after updating Firefox to version 50?

Question

After updating Firefox to version 50.0 my Firebug opens the default developer tools. The original Firebug doesn\'t work anymore.

I have always preferred Firebug as m

Answer 1

Uninstall Firefox completely including deleting the Mozilla folder within your APPDATA.

Then reinstall Firefox and add both Firebug and FireQuery.

After that everything should work as before.