I've installed the firefox latest version but the old firebug is removed. I install the old firefox (49.0.1) but facing the same problem I do not find the firebug in any URL and add-ons.
Developers Tools are now an integral part of FireFox which makes FireBug obsolete.
Tools > Web Developer
If you need/want to use Firebug with firefox 49.0.1 (or even v56)
Install the addon "Classic Add-ons Archive" and from this addon you can install Firebug 2.0.19 or any other legacy addon that Mozilla has removed from its web.
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