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?
Alla svar (1)
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.