Browsers and cookies

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Proton services use the time on your device to verify that keys and signatures are still valid. This helps ensure your files stay secure.

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Proton Mail requires a browser that supports the Web Cryptography API in order to secure your data. We explain what Web Crypto is.

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Proton Mail provides email access over the Tor network through our onion site at https://protonirockerxow.onion. If you are connected to Tor and using Firefox, there is another step you may have to follow to be able to access onion sites.

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Learn how to turn Private Browsing on and off in iOS Safari. Private Browsing can block cookies that are needed to implement Proton Mail's encryption.

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Both the browser cache and cookies can cause minor issues when using Proton Mail. In this article, we show you how to clean them in all major browsers.

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JavaScript must be enabled in your browser for Proton Mail to work correctly,. In this article, we show you how to enable JavaScript in all major browsers.

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One of the requirements for using Proton Mail on some browser is enabling cookies. Learn how to enable cookies for easy usage of Proton Mail

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Proton Mail and Proton VPN require JavaScript, sessionStorage, and cookies to ensure the security and privacy of your data.

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Learn how to use Private Browsing (also known as Incognito) mode in your browser to access Proton Mail more privately.

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Proton Mail generates random numbers in several places to secure your account. Learn why you need PRNG to use Proton Mail.

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Proton Mail has been fully tested and works well with most modern browsers. But we only recommend browsers that also respect your privacy.

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Proton Mail uses Let's Encrypt as its certificate authority. This article describes the steps to verify our certificate for various browsers.

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Troubleshooting errors using Proton Mail in iOS browsers (Safari, etc)

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Allowing session storage on most used browsers Chrome, Firefox, Safari, IE