Just a heads up, I saw no datepickers in Firefox 26. Here are the JS errors from the console:<p><pre><code> Blocked loading mixed active content "http://jonthornton.github.io/jquery-timepicker/jquery.timepicker.js"[Learn More] Datepair.js
Blocked loading mixed active content "http://jonthornton.github.io/jquery-timepicker/jquery.timepicker.css"[Learn More] Datepair.js
Blocked loading mixed active content "http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/ui-lightness/jquery-ui.css"[Learn More] Datepair.js
TypeError: $(...).timepicker is not a function Datepair.js:95
TypeError: $(...).timepicker is not a function Datepair.js:153
TypeError: $(...).timepicker is not a function Datepair.js:205
TypeError: $(...).timepicker is not a function Datepair.js:248
TypeError: $(...).timepicker is not a function Datepair.js:403
</code></pre>
It looks like HTTPS Everywhere is switching to <a href="https://" rel="nofollow">https://</a>, so you just need to change some <a href="http://" rel="nofollow">http://</a> URLs to protocol-relative URLs (starting with "//").<p>Hope this helps.