1. Open Firefox.
  2. Click the hamburger menu at the right of the address bar.
  3. Click the Options icon.
  4. Choose Applications from the sidebar at the left.
  5. Type mailto into the search bar and then click the link that remains below to highlight it.
  6. Choose an option from the drop down menu with an email client you’d prefer to use. Alternatively, you can add your own if your preference isn’t listed. If you have the client installed, it’ll typically display in this window.

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