Firefox has an irritating habit of switching into “Work Offline” mode if it detects that the Internet connection drops. If you’re working somewhere with dodgy Wi-Fi, it can mean constantly having to go the “File” menu to disable it. The good news is that there’s a new option available in Firefox 3.6 and above that you can use to prevent the browser from automatically switching into “Work Offline” mode.
To set the option, type about:config in the browser’s address bar. Then right-click anywhere in the window, and click New->Boolean. The preference name needs to be entered as network.manage-offline-status. Set its value as false. If that all sounds a bit complex, here’s a short screencast showing all of the steps:
Note that setting this option just prevents Firefox from entering Work Offline mode automatically; you can still set it manually via the “File” menu.