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Browsers - Bypassing HSTS Warnings

Sometimes a browser displays an HSTS warning.

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Some browsers use HSTS (HTTP Strict Transport Security), which tells a web app to use HTTPS. If the warning persists, clear the browser cache. In Firefox, open Privacy settings and clear recent history with Cache and Active Log-ins selected and the time range set to Everything, then click Clear now.

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As a last resort, you can disable HSTS in Firefox:

Enter about:config in the Firefox address bar. If a warning appears, click OK.

Find network.stricttransportsecurity.preloadlist, right-click it, and set it to false.

If the preference is not listed, right-click the page, select New > Boolean, enter network.stricttransportsecurity.preloadlist, and set it to false.

Last updated: October 16, 2026

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