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:

Faster page load: visitors are only served the smallest image size necessary for their screen
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
Ensures visual consistency between images embedded manually from Flickr, images embedded using the Caption shortcode and images embedded using the Flick Embed block
Increased SEO by automatically using Flickr metadata to set titles and captions

Plugin features:

Systematically add classes to Flickr Embed blocks
Customize what happens when clicking on an image embedded with the Flickr Embed block
Assign the Flickr photo title to the tag
Make the Flickr photo page URL open in a new window
Automatically add a caption with the Flickr image title, and optionally hyperlink it
Make Flickr images responsive with srcset and sizes attributes, just like native WordPress images, improving the website loading time while serving better images to visitors.
Replace the hyperlinked Flickr page with the JPG image
Wrap lone <img> tags inside <figure> tags
Responsify caption shortcodes with fixed width, used in older version of WordPress

Plugin chracteristics:

Does NOT create new image sizes
Does NOT modify the database to operate. However, for debugging purposes, it can clear up cached oEmbed meta_keys in wp_postmeta faster than the 24-hour default
Lightweight (one single PHP page)
Has no visible component on the front end
Does not increase the site response time, provided a caching plugin is used

Configuration

To configure plugin, go to ‘Settings’ -> ‘Embed Pro Flickr’ from the WordPress dashboard