Hi. Love the plug-in!
Just thought you should know I've tested it with the latest release of Chrome, Explorer, Safari and Firefox, but found a problem with Firefox & Youtube videos.
When a Youtube video is on a page and you attempt to re-size the browser window to make it smaller, the moment you hit the max size of the site (forcing responsive) the browser window snaps back to it's original size.
It's really odd. Not sure what's causing it. I've only tested Youtube and Vimeo videos and of the two, pages containing Youtubes were the only ones with the issue.