More/Less
MailExtension · v3.0.0

More/Less, inside Thunderbird.

A small compose-window add-on. Draft a crisp summary and expandable sections without leaving your mail client — Thunderbird opens them in place.

  1. 01

    Download

    Get moreless-3.xpi below. It works with Thunderbird 115 and newer.

  2. 02

    Open Add-ons

    In Thunderbird, open the menu ☰ → Add-ons and Themes.

  3. 03

    Install from file

    Click the gear icon ⚙ → Install Add-on From File… and choose moreless-3.xpi. Confirm the prompt.

  4. 04

    Compose

    Write a new message. A More/Less button appears in the compose toolbar.

  5. 05

    Replace message

    Add your subject, summary, sections and pictures. Replace message creates the whole email and removes the previous body and signature. Recipients stay unchanged.