How to revert Firebug to old version?

Question

I\'ve opened a Firefox today, hit the Firebug button and it showed me that in the new version it is integrated into the developer tools.

I hit ok and realized that i

Answer 1

In additional to @Sebastian Zartner's answer, (from Firebug's website):

Firebug 2 doesn’t work in multi-process browsers (i.e. e10s) and converting it is too complex, so it will stop working when e10s is activated in Firefox. You will be able to disable e10s for a while to keep using Firebug 2, but this won’t last forever.

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More about your question:

• Firebug is not working with Firefox version 50.0

• Why got Firebug removed after updating Firefox to version 50?