1108380 - Flash content is loaded despite "Ask to activate" enabled

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Plug-ins, defect)

Description

[Artem Kuroptev]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Build ID: 20141125180439

Steps to reproduce:

Flash is in the "Ask to activate" mode. Visit some page with Flash content (ie speedtest.net) in the Private Mode. 


Actual results:

While a web page with Flash content is loading, Flash content on a page is loaded and rendered for a short time, then "Ask to activate" placeholders appear.
Whether Flash content is a streaming media player, then the network load generated by such a player is visible despite  "Ask to activate" placeholder.

In the Private Mode I can reproduce the behavior on each browser restart, in normal mode I can't (not sure, if it is not present or it's too quick).


Expected results:

I suppose, Flash content should not be loaded upfront.

Comment 1

[:Gijs (he/him)]

When you say "private mode" do you just mean "private window", or are you restarting Firefox with history disabled ?

Can you reproduce this on a clean profile? ( https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles )

(I can't reproduce this in a private window using Firefox 35 rc on my mac - but it could be that either this was fixed in 35, or only happens on Windows?)

Comment 2

[Wayne Mery (:wsmwk)]

Artem hasn't replied. so => incomplete.
See also bug 1115065.

If you choose to reply, please give more information, including a URL of the flash page

Comment 3

[Artem Kuroptev]

Wayne, guys,

sorry for delay with my answer. I was on the road. 

As for the bug:

1. When I say "private mode", I mean  "private window" (ctrl+shift+p). 
2. The bug persist in 35.
3. I face with the bug on two machines (both Win 7 Pro, x64, Intel i3 and DC E6600).
4. Unfortunately, I can't find a way to reproduce it. It reappears time to time, but I can't find strong correlation with network latency, CPU or memory use, or specific website. When I was reporting this bug, it persisted through browser restarts, but not anymore. I have tried to create a simple test page with multiple Flash objects with autoplay, but fails to reproduce the bug. I would believe that it's some local interference with my environment or plugins, but I use a few, and face with the behavior on separate machines. 

So, let the bug remain 'incomplete' until I can provide more details.

Thanks.

Comment 4

[Artem Kuroptev]

Here is the page:
http://www.reuters.com/article/2015/08/21/us-china-economy-pmi-idUSKCN0QQ05H20150821

Here is how it  looks while loading:
https://youtu.be/Qe1cszLf4o0

I am not sure, that this is a Flash content displayed (since it does not autostarts, so maybe this is some preview), but the page does not have such an image in the Media section of Page Info.