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I'm trying to register and firefox is telling me there's no internet connection

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When I try to register for Firefox sync, it tells me there is no internet connection. That's the only window that gives me that error message - I'm able to browse on Firefox in other tabs, and any other browser.

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You need to update to be able to use Firefox Sync. You can't do it on Firefox 43.0 because the Firefox Sync sign in page location has changed.