Firefox starts in 'offline' mode
Firefox starts in off line mode. Unchecking works, until a restart. I use Ubunto.
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Try http://kb.mozillazine.org/toolkit.networkmanager.disable
If that doesn't work then try to create a new Boolean pref with the name network.manage-offline-status and set the value to false.
Right-click on the about:config page to open the right-click context menu and use "New > Boolean" to create a new Boolean pref.
Name: network.manage-offline-status
Value: false