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: A major shift in Thunderbird's extension architecture caused many popular older add-ons to stop working in newer versions. For those who rely on specific productivity tools that haven't been updated, staying on an older build is often the only way to keep their workflow intact.
Modern marketing emails are essentially complex web pages. Older versions of Thunderbird use older HTML rendering engines. Consequently, modern emails often look broken—images won't load correctly, layouts will shatter, and text will misalign. older versions of thunderbird