It is important if you care. They sign releases with the same Tor Browser key. Instructions are found on this page: https://mullvad.net/en/help/verifying-mullvad-browser-signature

You need 2 files (both are on the download page):

• Browser file
• Signature file

The basic process is as follows:

1. Obtain signing key.
2. Verify browser using signature file.

Note: Ignore warning about the key not being signed with a trusted key (we skip an unnecessary step for a begineer walkthrough)

You can double check everything I said by looking at their instructions.