Firebug toolbar button is always shown deactivated since Firefox 51.0.1

There is a solution to use Firebug version 2.0.18 in the latest version of Firefox (this time 51.0.1).

To enable the old Firebug:

In the address bar, enter about:config and
find browser.tabs.remote.autostart. Set it to false.

Also set browser.tabs.remote.autostart.1
and browser.tabs.remote.autostart.2 to false.

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