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Embed Pro Flickr is a WordPress plugin designed to help you customize the Flickr images embedded on your website, especially when working with the Flickr Embed block inside the Gutenberg editor. 
It also takes cares of Flickr images embedded manually, especially before WordPress 5.0, ensuring consistency in the visitor experience, and without modifying the database.
It is aimed at Flickr photographers who are also WordPress bloggers, and particularly to those who have been using this combo over the years and seen breaking changes.
Expected impact:
<ul>
<li>Faster page load: visitors are only served the smallest image size necessary for their screen </li>
<li>More visually appealing: higher resolution images are made available to the browser, for example to visitors with Retina screens, thanks to the image sizes already processed by Flickr </li>
<li>Ensures visual consistency between images embedded manually from Flickr, images embedded using the Caption shortcode and images embedded using the Flick Embed block</li>
<li>Increased SEO by automatically using Flickr metadata to set titles and captions</li>
</ul>
Plugin features:
<ul>
<li>Systematically add classes to Flickr Embed blocks</li>
<li>Customize what happens when clicking on an image embedded with the Flickr Embed block </li>
<li>Assign the Flickr photo title to the tag</li>
<li>Make the Flickr photo page URL open in a new window</li>
<li>Automatically add a caption with the Flickr image title, and optionally hyperlink it</li>
<li>Make Flickr images responsive with <code>srcset</code> and <code>sizes</code> attributes, just like native WordPress images, improving the website loading time while serving better images to visitors. </li>
<li>Replace the hyperlinked Flickr page with the JPG image</li>
<li>Wrap lone <code><img></code> tags inside <code><figure></code> tags</li>
<li>Responsify caption shortcodes with fixed width, used in older version of WordPress</li>
</ul>
Plugin chracteristics:
<ul>
<li>Does NOT create new image sizes</li>
<li>Does NOT modify the database to operate. However, for debugging purposes, it can clear up cached oEmbed meta_keys in <code>wp_postmeta</code> faster than the 24-hour default</li>
<li>Lightweight (one single PHP page)</li>
<li>Has no visible component on the front end</li>
<li>Does not increase the site response time, provided a caching plugin is used</li>
</ul>
<h3>Configuration</h3>
To configure plugin, go to ‘Settings’ -> ‘Embed Pro Flickr’ from the WordPress dashboard

Embed Pro Flickr

Embed Pro Flickr helps you customize Flickr photos embedded in your WordPress site, improving user experience, performance and SEO.

WordPress.org

George Stephanis

Helen Hou-Sandi

Andrew Nacin

Kelly Choyce-Dwan

Brandon Lavigne

Chris Coyier

tevko

Joe McGill

wilto

Jasper de Groot

Bringing automatic default responsive images to WordPress.
This plugin works by including all available image sizes for each image upload. Whenever WordPress outputs the image through the media uploader, or whenever a featured image is generated, those sizes will be included in the image tag via the srcset attribute.
Important notes
<ul>
<li>As of WordPress 4.4, images are responsive by default. If you are on WordPress 4.4 or plan to update, you will not need to install this plugin.</li>
</ul>
If you have had this plugin installed since before version 2.5 but are running version 4.4 of WordPress, it is important that you leave the plugin installed. This is because all versions of the plugin before version 2.5 relied on a <code>data-sizes</code> attribute being present on an image in order to provide the responsive markup needed. If the plugin in this case is removed, then images in posts will be left with invalid markup. We are working to address this issue, and you can keep track of our progress here at https://github.com/ResponsiveImagesCG/wp-tevko-responsive-images/issues/178.
You can still use the plugin for advanced image compression support or as a simple way to include the picturefill script. The plugin will fall back to WordPress default functions if responsive image support is detected in your installation.
<ul>
<li>
Version 3.1.0 includes important changes that make this plugin compatible with WordPress version 4.4. Upgrading is highly recommended.
</li>
<li>
As of version 2.5.0, the plugin adds <code>srcset</code> and <code>sizes</code> attributes to images on the front end instead of adding them to the image markup saved in posts.
</li>
</ul>
Full documentation and contributor guidelines can be found on <a href="https://github.com/ResponsiveImagesCG/wp-tevko-responsive-images" rel="nofollow ugc">Github</a>

RICG Responsive Images

Bringing automatic default responsive images to WordPress.

Embed Pro Flickr vs RICG Responsive Images