Posteo Help Help categories Article

This article is tagged with: FirefoxMailvelopeEnd-to-end encryption

How do I install the Firefox add-on Mailvelope?

Many Firefox add-ons can be found directly using the Firefox add-on search. If you are unable to find an add-on, there is an alternative way to proceed.

This help article uses Mailvelope as an example to explain how to download and install an add-on from the provider’s website.

Before you begin: Current security notice (May 2017)

We have had a current security audit (May 2017) of Mailvelope undertaken, in which a critical weakness in the interaction between the browser Firefox and Mailvelope was found. Under specific circumstances, the Firefox security architecture allows attackers to access a user’s private keys via compromised add-ons. You should therefore make sure to note the additional security recommendations in the article on setting up Mailvelope.

Installing an add-on

  1. Open the website for the add-on (e.g. Mailvelope)
  2. Click the download link for the add-on
Install Firefox add-on: step 1 to 2
  1. To install the software on your computer, click Allow
Install Firefox add-on: step 3
  1. Wait until Firefox has downloaded the add-on and then click Install now
Install Firefox add-on: step 4

You have now successfully installed the add-on.

Install Firefox add-on: done

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