[Bug] Thunderbird ignores SVG image size in the message viewer (but displays correctly in message editor)

pedrolino — Wed, 15 Apr 2026 11:53:41 GMT

When I send an email including an HTML signature, it points to an online image which is resized by

and it shows as I expect it in the Editor window before I send it

However when I open the message in the Sent folder, the image is shown at 100%

To be honest, using SVG as a source seems to be a bad option... I just noticed that the result is different from the displayed on the Thunderbird Editor window on both gmail (ignores it) and mailbox (different size)...

I don't have a suggestion (because SVG is the problem) but at least there should be consistency between the Editor and the Viewer within Thunderbird. I was convinced people were receiving what I saw in the Editor window...

topic [Bug] Thunderbird ignores SVG image size in the message viewer (but displays correctly in message editor) in Discussions

[Bug] Thunderbird ignores SVG image size in the message viewer (but displays correctly in message editor)