To allow the JSON Diff tool to work for actors and widgets, the Visualfroce page domain needs to add under the trusted domain for inline frames in the Salesforce org settings.
Note
If you do not perform the steps mentioned in this section, the JSON Diff tool will not work.
Prerequisites
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None.
Steps
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Log in to your Salesforce account.
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Go to Setup > Setup.
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In the Quick Find box, search for
Session Settings
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In the Trusted Domains for Inline Frames section, click Add Domain.
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On the Trusted Domain for Inline Frames page, in the Domain box specify the Visualforce page domain name.
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Click Save.