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Toggle Line Wrap 1.5.2
von Jan Kiszka
Toggle wrapping of long lines in the message composition window when writing plaintext messages. Wrapping can be controlled via a toolbar button and a keyboard shortcut.
Über dieses Add-on
On order to use the add-on, turn off HTML composition (per account setting, Composition & Addressing → Composition → Compose messages in HTML format) and also make sure that "mailnews.send_plaintext_flowed" is disabled in the configuration (about:config). Furthermore, mailnews.wraplength needs to be non-zero, or the add-on will be deactivated (toolbar button grayed out).
Note that this add-on requires an WebExtension Experiment API, thus will request "full access" on installation.