Firefox : Session doesn't load with a 'Please allow local storage of data in your Flash Player' message.
Posted by Conal Mullan on 08 January 2019 08:21 AM

It some later versions of Firefox there could be a new feature enabled by default which forces Flash to run in a sandbox - meaning it cannot access local storage.

It generates a 5031 error in OnSync. 

You will see a message like this :



To fix this, you need to disable the Flash sandbox in Firefox, follow these steps:

1 - In the address bar, type about:config and press Enter.

2 - The about:config "This might void your warranty!" warning page may appear. Click I accept the risk! to continue to the about:config page.

3 - Find the preference dom.ipc.plugins.sandbox-level.flash and double-click on it.

4 - Enter an integer value of 0 (zero) and click OK.

5 - Quit and reopen Firefox so that the change will take effect.

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