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CloseReview for Signature Switch by DonCoryon
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This add-on, while well intentioned, falls drastically short of what it tries to accomplish.
Features it doesn't have:
*** Ability to place signature under your reply. (it puts your signature at the bottom of the email regardless of how many replies are beneath, thus making a signature pointless)
*** It also forces you to make a text file, save it somewhere, then point to it.
Use the extension Quick Text:
https://addons.mozilla.org/en-US/thunderbird/addon/640
Works just like Outlook's signature feature.
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