I have found a solution to use firebug [version 2.0.19] in latest version of firefox 53.03
Please follow the steps:
- In your address bar enter about:config, find
- browser.tabs.remote.autostart set it false
- browser.tabs.remote.autostart.1 set it false
- browser.tabs.remote.autostart.2 set it false
- Restart the Firefox.
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