Last updated: August 3, 2026

JSON Viewer Pro is a Firefox extension that lets you view selected JSON text in a formatted, searchable tree viewer.


JSON Viewer Pro does not collect, store, transmit, sell, or share any user data.

• The extension has no servers. It makes no network requests of any kind.
• When you select JSON text and choose "View JSON", the selected text is saved temporarily in your browser's local extension storage (browser.storage.local) on your own device, solely so the viewer window can display it. It never leaves your browser.
• No analytics, tracking, cookies, or third-party services are used.
• No personal information, browsing history, or website content is collected.

This is declared in the extension manifest under browser_specific_settings.gecko.data_collection_permissions with "required": ["none"].


The extension requests only two permissions:

• contextMenus — to add the "View JSON" option to the right-click menu.
• storage — to pass your selected text from the page to the viewer window, locally on your device.

If this policy ever changes, the updated version will be posted at this same address.


If you have questions about this policy, you can contact the developer through the Firefox Add-ons listing's support tab.