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How to have hyperlinks open a compose window in plain text?
In Thunderbird, I have "Account Settings / Composition and Addressing / Composition / Compose messages in HTML format" unchecked, and when I click "Write" in Thunderbird it opens a plan-text compose window as desired. However if I'm using FIrefox and click on a website's contact email hyperlink (e.g. "email@example.com"), it opens a Thunderbird compose window in HTML format rather than the plain text that I want. How can I change the default to plain text?