Lucy Tomas

<p>Very simple plugin that will search for all the first images of your published posts, pages or custom post types and set them as the featured image.</p>
<ul>
<li>You can choose the post type you want to run the plugin on.</li>
<li>Option to overwrite the already selected futured images.</li>
<li>Option to select From / To date.</li>
</ul>


Set All First Images As Featured

still works

It simply didn't recognize any images in any of the posts, and so didn't work. :(

Didn't see the images in the posts

IT works on 5.0.3

Sets the first image of your posts, pages or custom post types as the featured image.

Kostas Vrouvas

<p>A small plugin to add featured images in the “All Posts” page.</p>


Easy Featured Images

A small plugin to add featured images in the "All Posts" page.

Set All First Images As Featured vs Easy Featured Images