Firefox for Android will not install on my Sansung Galaxy Tab 3 10.1.
An error message, "-24" is displayed,
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How are you downloading Firefox? Using the Google Play Store?
Yes, with Google Play Store.
This is the result of the Android OS corrupting the install of Firefox for Android. You can try opening the Android OS settings > selecting Apps > selecting Firefox > select uninstall > then try reinstalling via the Play Store.