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Firefox for iOS 10.3.3 does not open on iPhone 5. Also, no option to choose browser

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Downloaded Firefox for iOS from App Store, pressed "Open" button, Message said "Thank you for choosing Firefox" but did not open. Also, there is no option in Settings to select a browser

Downloaded Firefox for iOS from App Store, pressed "Open" button, Message said "Thank you for choosing Firefox" but did not open. Also, there is no option in Settings to select a browser

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I finally found Sign-in under the Settings list by swiping left a couple of times. That gave me most of my Firefox. Now I just have to find my search engine