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Re:Firefox 23 will block non-SSL content on SSL pages by def... by Hello71 on Monday April 08, 2013 @08:31PM (#5515699)
Firefox saves all assets to a _files directory then fixes the URLs to point in there.

If you really, really want to use //:

  busybox httpd -p 8080
Re:Firefox 23 will block non-SSL content on SSL pages by def... by khuey on Monday April 08, 2013 @08:44PM (#5515742)
or python -m SimpleHTTPServer 8080
Re:Firefox 23 will block non-SSL content on SSL pages by def... by fein on Monday April 08, 2013 @10:05PM (#5516047)
Hell, even new PHP comes with a packaged local dev server.
Re:Firefox 23 will block non-SSL content on SSL pages by def... by TeMPOraL on Tuesday April 09, 2013 @01:34AM (#5516614)
But it would suck that you'd have to launch a server just to view an HTML file locally... (actually, the problem is already here for some time, thanks to JS requiring protocols to match to fetch data).