Hide all images on a page in Firefox (plain text only)

Can I hide all images displayed on a page in Firefox?
I want to view the page in plain text only (with no images).

Is there any Firefox add-on for this?

You don't need an extension in order to do this. Simply go into your options, and under the content tab, unselect Load Images Automatically. Note that most of the formatting will be preserved.

You can use a bookmarklet, which work on almost, if not all, web browsers.

Here is a link with a good list of them, Zap images is probably the one you are looking for: https://www.squarefree.com/bookmarklets/zap.html

You can use Image-Show-Hide add-on.

Simply turn on | off images on all web-pages and (optional) auto-reload current