Apply local draft version or discard it
Indent with tabs
Auto-run code (beta)
Only auto-run code that validates
Auto-save code (bumps the version)
Auto-close HTML tags
Clear console on run
Live code validation
Highlight matching tags
Show boilerplates bar less often
No autoresizing to fit the code
Render blocking of the parent page
When downloading an MP3 from a URL that 302 redirects, Firefox Developer Edition 40.0a2 (and many previous versions) downloads the 0 byte redirect response, without requesting the URL which the 302 response indicates.
Add title to make the fiddle public.
/echo simulates Async calls:
See docs for more info.
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