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Disable your Tor Browser's NoScript XSS setting

If your security slider is set to Safest, JavaScript is disabled so XSS vulnerabilities won't affect you, which makes it safe to disable NoScript's XSS protections.

Here is how to disable this setting:

1. Click the menu icon in the top-right of Tor Browser and open "Add-ons"
2. Next to the NoScript add-on, click the "Preferences" button
3. Switch to the "Advanced" tab
4. Uncheck "Sanitize cross-site suspicious requests"

If you'd like to learn technical details about this issue, check this issue on GitHub.