How can you fix the problem of html signature appearing when not checked?
I created a signature (including an image) by writing what I wanted in Thunderbird email, then highlighting the image, then clicking Insert, then clicking html, then highlighting the raw code, then inserting into the Tools/Account Settings and pasting it into the box for Signature Text (also put a check mark in the "Use html" box). I only want to use the signature on certain emails. I thought that if I unchecked the "Use html" box after writing an email where I needed the signature, that on subsequent emails it would not appear. That doesn't work. What happens is that the html text (but not the image) still appears. Why is that?
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The "use html" checkbox enables the use of html coding in a signature. It doesn't enable/disenable the signature itself.
I use the Signature Switch add-on to choose whether or not to use a signature, and which signature to use when I do want one.
https://addons.mozilla.org/en-us/thunderbird/addon/signature-switch/
To use your signature with this add-on, you'll need to move your signature code into an html file, and remove it from the box in account settings.