I think this might be what you're looking for.
Go to My Profile > Edit Display
Scroll down to the Thread Display Options.
The first section is called Visible Display Elements where you can click checkboxes to de-select the display of signatures, avatars, and images.
Hope that helps.
Quote:
Visible Display Elements
You have the option to show or hide various elements of messages, which may be of use to users on slow internet connections, or who want to remove extraneous clutter from posts.
Show Signatures
Show Avatars
Show Images (including attached images and images in [img] code
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