關於此附加元件
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 (CTRL-SHIFT-W by default). The current state is visualized in the toolbar button. The shortcut can be adjusted via the Add-on Manager (click on the gear).
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.
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.