How to remove or strip images in email signatures in Thunderbird?

Question

I get really annoyed by people, clients or companies putting images in their signatures, be it small or large images or nowadays animated gifs.

Is there a setting or add-on for Thunderbird to hide, strip or remove:

a) ...the complete signature inside an email?

b) ...hide/block/remove all images inside a signature of an email?

c) ...hide all embedded images inside emails if none of the above work?

Answer 1

There is a way by using userContent.css in Thunderbird.

Create the folder chrome in your profile folder and place the file userContent.css inside.

Add images, styles, whatever to it, to hide all gif images i.e.:

img[src*=".gif"] {
    display: none !important;
}

Or keep a list of files you want to hide:

img[src*="stupid-animation.gif"],
img[src*="disturbing-ad.jpg"] {
    display: none !important;
}

Restart Thunderbird, enjoy.