My icons / images are missing when I reply / forward in Thunderbird.

In case you can't see images in your signature when you Reply or Forward, this is the result of your Thunderbird setting. Your recipients will see the images and your signature just fine.
You can change Thunderbird settings so you will also be able to view the images. To do so, please follow the instructions in this link on how to enable images:How to display images automatically in Thunderbird 3

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