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Sometimes Firefox automatically switches to “Offline Mode” [Work Offline Mode] on trivial issues like a router reboot or a temporary DNS Error. The trouble is, FF fails to come back out of it even after the problem is resolved after a few minutes.
In Firefox’s addressbar type
Then enter the following in “filter”
network.manage-offline-status to “false”
toolkit.networkmanager.disable to “true” [This setting's available only in older versions of FF]
browser.offline-apps.notify to “false”
Alternate Addon: StayOnline