Firebug will not open/start - firefox

I really hope someone can help me with this, I am stumped!
I had the latest FF and then a defect came in specific to FF ESR. I installed ESR to different directory and created it's own profile so I could use two FF instances side by side. After doing this though Firebug will no longer open/start.
Environment:
Windows 7 -
Firefox 36.0.4 -
Firefox 31.5.3 (ESR) -
Firebug 1.12.8
I have done the following but still won't open:
Uninstalled both latest and ESR Firefox
Deleted Mozilla directories in:
C:\Program Files (x86)
C:\Users\james\AppData\Local
C:\Users\james\AppData\Roaming
Ran CCleaner
Restarted machine
Fresh install of latest Firefox
Fresh install of Firebug 1.12.8
Firebug 1.12.8 didn't work
Removed Firebug 1.12.8 and installing Firebug 2.0.8
Same behaviour for Firebug 2.0.8
Still unable to open/start Firebug....
During the fresh install - are there any directories I should have deleted that I didn't?
Any other ideas?
All help will be greatly appreciated!! :)
Thanks all in advance!
James :)

Same issue happened to me but on Windows 10. Following instruction resoved it for me.
1) Follow this instruction: https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer
2) Make sure you remove Mozilla in these 2 directories:
-C:\Users\THISUSER\AppData\Local\Mozilla
-C:\Users\THISUSER\AppData\Roaming\Mozilla
3) Restart machine, reinstall firefox and reinstall firebug etc ...
It should work after that. tested.

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