As isolated in Bug 1341191 the "Always use..." checkbox isn't usable for web feed readers. STR: 1. Go to the feed preview of https://www.npr.org/rss/podcast.php?id=510289 2. Select My Yahoo and Always use and click subscribe now 3. Return to https://www.npr.org/rss/podcast.php?id=510289 and notice it isn't checked Manually setting a default in the prefs or using about:preferences#applications causes the page to do a blank white page. To set the default action manually: 1. about:preferences#applications 2. Search Web Feed 3. Change the dropdown to something else
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