Firefox goes into offline mode for no reason
Periodically, with no consistency I can detect, Firefox puts itself into offline mode. After clicking the "try again" button from one to several times, it finally recognizes that there is in fact an Internet, and deigns to connect with it. I have never manually put Firefox into offline mode.
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You can try to create a new Boolean pref with the name network.manage-offline-status and set the value to false.
You can 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