Allowing sessionStorage

2 mins
Browsers and cookies

Proton Mail uses the latest web technologies to secure your data, including sessionStorage. In this article, we will explain what sessionStorage is and address common issues. 

What is sessionStorage?

sessionStorage is a new web technology that allows you to store website information securely on your device. We use sessionStorage to store your mailbox password(new window), which is used to decrypt all messages in your account. 

Without sessionStorage, we would need to ask you for your mailbox password(new window) every single time you read or send an email. 

I got an error saying I don’t have sessionStorage. How do I get it?

As the first step, check if your browser supports sessionStorage. You can find a list of supported browsers here(new window).

For All Browsers: 

Please ensure that cookies are enabled.


1. Enter about:config in the address bar.

2. Click Accept the Risk and Continue.

3. Type in in the search bar. Change the value from false to true.


You can enable sessionStorage in Chrome and other Chromium-based browsers by following this article


Instead of using incognito mode, switch to regular browsing mode instead. sessionStorage is automatically enabled in Safari by default. 

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