Configuring Mozilla Firefox for using an ID-card

To use the ID-card with Mozilla Firefox, you will need to keep your ID-software updated, so To use an ID card in the Mozilla Firefox web browser, you need to keep your ID software up to date, so be sure to update your web browser software. Additionally, you must allow the use of the “Web eID” and “PKCS11 loader” extensions in the Firefox web browser.

If malfunctions occur – for example, you will not be able to digitally sign e-services, confirm activities, etc. – The most common reason is the inactivated “Web eID” and “PKCS11 loader” extension.

With our step-by-step instructions, you can easily and conveniently check that your browser is ready to use your ID card!

Step 1: Open extensions in your browser

Click on the icon with three dots on the right-hand side of Mozilla Firefox and select “Add-ons and themes“.

Step 2: Open extensions in the manager

In the left menu of the Manage Your Extensions, there is an “Extensions” option with a puzzle icon. Click on it and you will see the extensions PKCS11 loader and Web eID with the ID icon in the opened view.

NB! “PKCS11 loader” extension is only required for Linux operating system.

NB! If there is a “Token signing” extension in the extension selection, it should be removed. Instructions for removal can be found here.

Step 3: Enable Web eID and PKCS11 loader extensions

Find the extensions named Web eID and PKCS11 loader and make sure they are Enabled. If not, enable it.

The blue indicator in the right corner refers to the activated state of the extension.

If you accidentally removed the “Web eID” or “PKCS11 Loader” web extension, you can manually reinstall it from the Mozilla Firefox web store.
Web eID –
PKCS11 loader –

Step 4: Check whether using the ID-card is now possible in web browser

After enabling the Web eID and PKCS11 loader extensions (step 3), restart your browser: everything should work!