Brandon Moeller

This plugin allows publishers to better control the width of photos that use the WordPress caption shortcode feature, when that content is displayed in RSS feed readers like Google Reader, as displayed on small-screen mobile devices.
This plugin accomplishes the same thing that adjusting the “function img_caption_shortcode” code in includes/media.php would, but allows the user to automatically update WordPress without worrying about losing these changes.
It is the author’s hope that in future releases of WordPress (post 3.3), this plugin will prove unnecessary if (hard-working, responsive-minded) WordPress core developers decide to include the fix in newer versions of the awesome great open source software we have all come to love.
The code for this plugin was inspired by code found on this page of the codex: 
<a href="https://codex.wordpress.org/Function_Reference/add_filter" rel="nofollow ugc">https://codex.wordpress.org/Function_Reference/add_filter</a>
Read more about RSS Responsive Caption on the author’s website here: 
<a href="http://brandonmoeller.com/blog/2011/12/18/rss-responsive-caption/" rel="nofollow ugc">http://brandonmoeller.com/blog/2011/12/18/rss-responsive-caption/</a>

RSS Responsive Caption

Improves WordPress caption elements so captioned images in RSS feeds responsively adjust to fit within Google Reader’s screen on Android devices.

No Frills Plugins

RSS CORS Enable is a simple yet powerful plugin designed to solve the common problem of accessing WordPress RSS feeds from different origins. By default, accessing WordPress RSS feeds via JavaScript from a domain different than the one where WordPress is hosted can result in Cross-Origin Resource Sharing (CORS) errors. This plugin addresses this issue by adding an <code>Access-Control-Allow-Origin: *</code> header to your WordPress RSS feed, making it accessible from any origin.

RSS CORS Enable

This plugin adds the necessary CORS (Cross-Origin Resource Sharing) header to your WordPress RSS feed, allowing it to be accessed from any origin.

RSS Responsive Caption vs RSS CORS Enable