[tor-bugs] #8674 [EFF-HTTPS Everywhere]: Installing HTTPS Everywhere + security.mixed_content.block_active_content breaks Youtube.com

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#8674: Installing HTTPS Everywhere + security.mixed_content.block_active_content
breaks Youtube.com
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 Reporter:  pjpii                 |          Owner:  pde          
     Type:  defect                |         Status:  new          
 Priority:  normal                |      Milestone:               
Component:  EFF-HTTPS Everywhere  |        Version:  HTTPS-E 3.1.4
 Keywords:                        |         Parent:               
   Points:                        |   Actualpoints:               
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 Issue:
 With "HTTPS Everywhere" installed and the Firefox setting
 "security.mixed_content.block_active_content" set to "true" all Flash
 videos on Youtube.com give the error "An error occurred. Please Try Again
 Later." This error persists ever after the "HTTPS Everywhere" extension is
 disabled, removed and/or all options effecting Youtube.com are disabled.

 Steps to Reproduce:
 1. Create a new Firefox profile and start Firefox.
 2. Go to about:config and set
 "security.mixed_content.block_active_content" to "true".
 3. Install the "HTTPS Everywhere" (stable) extension.
 4. Visit Youtube.com and try to watch a video.

 Expected Results:
 Youtube video plays.

 Actual Results:
 All Flash-based videos return, "An error occurred. Please Try Again
 Later."

 Tested Environment:
 Windows 7 (x64)
 Mozilla Firefox 20

 Other:
 Per Mozilla bug https://bugzilla.mozilla.org/show_bug.cgi?id=834836 , the
 option "security.mixed_content.block_active_content" will default to
 "true" as of Firefox 23.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8674>
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