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about:synckey 1.1.1-signed.1-signed No Restart
View your Sync Key on your mobile device to set up Sync on a desktop computer.
About this Add-on
1. Install this add-on. It's restartless, so no restart required.
2. Open a new tab and go to about:synckey. Enter the Sync Key into your other device.
3. When you're done, you probably want to uninstall the add-on again to prevent easy access to your Sync Key.
You may also want to consider protecting your Firefox data on your phone using a Master Password with the Master Password add-on for Firefox Mobile