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Firefox hangs when trying to view flash content if explorer.exe is running without admin privileges




5 years ago
a month ago


(Reporter: Kostas, Unassigned)


18 Branch
Windows 8

Firefox Tracking Flags

(Not tracked)




5 years ago
User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Build ID: 20130104151925

Steps to reproduce:

Using Firefox 18 stable in a clean FF profile, with latest flash 11.5.502.146 in windows 8 x64 with an admin account.

I kiiled explorer.exe, and then 
- I either restarted explorer.exe first (via task manager) -without administrative privileges- and then launched Firefox
- or I either launched straightly Firefox (via task manager>File>Run new task) -with no explorer.exe running-.

Then, I tried  to open whatever page contains flash content, eg. a video in youtube.

Actual results:

Firefox hangs.

During the hang,
in task manager>details I see only (apart from firefox.exe) only the plugin-container.exe process:
the two necessary instances of FlashPlayerPlugin_11_5_502_146.exe are missing: this is the root of the problem, I think.

Expected results:

The flash content should play normally.

If, on the other hand (after I kill explorer.exe),
if, instead, I restart explorer.exe (via task manager) with administrative privileges, and then launch Firefox,
then flash works ok in all sites, and of course the two instances of FlashPlayerPlugin_11_5_502_146.exe appear correctly in task manager.

To sum it up:
I believe that Firefox, if explorer.exe is launched without admin privileges, or it's not running at all,
then Firefox hangs when trying to view flash content.
I didn't have this problem in windows 7 x64.
I don't think that any of us triagers can test this on Windows8

Reporter: Is this a new issue in FF18 ?
This could be invalid in case the you need the admin rights to open the flash plugin file
Component: Untriaged → Plug-ins
Keywords: qawanted
Product: Firefox → Core

Comment 2

5 years ago
Does Firefox recover from the hang after 45 seconds, or is the hang permanent?

Is this specific to Windows 8, or is this a setup you've used in the past on Windows 7?

Comment 3

5 years ago
No, I also had the same issue with FF17.

Unfortunately, the hang is permanent.

And, the laptop that I use, currently only has Windows 8.
Previously, when it had Windows 7, 
I recall that I had restarted explorer.exe many times,
not caring if it had admin privileges or not,
and this problem never occured.

Comment 4

5 years ago
Please check these screehsnots:

in windows 8, when you click Task manager>File>Run New task
there's an option "Create new task with admin privileges", which is not ticked by default, even if you are using an admin account.

On the other hand, I just checked, and, in windows 7, http://www.trishtech.com/img_art/win7_kill_restart_explorer_2.jpg
the Task manager>File>New task(Run...)
launches every process with admin privileges without an option to do otherwise.

Therefore, that's why I never had this problem in win7 when restarting explorer.exe.

(the 2nd screenshot is from a webpage: http://www.trishtech.com/win7/easily_exit_and_restart_explorer_in_windows_7.php).
I confirm the freeze on Win 8 x64 starting explorer.exe without administrative rights. The two instances of FlashPlayerPlugin_11_5_502_146.exe are missing.
I see no freeze if running explorer.exe with administrative rights.

This is not reproducible on Win 7 with the latest Flash. But I've managed to reproduce once the freeze on Win 7 using an old Flash ( After couple of seconds Flash crashed: https://crash-stats.mozilla.com/report/index/bp-17052405-b106-4806-bbd5-dca802130111. Considering this last statement, I'm wondering if this couldn't be a Flash issue and not a Firefox one?
Keywords: qawanted

Comment 6

5 years ago
I don't really know win8 that well... under what normal conditions would explorer not already be running? Isn't explorer the shell?

Comment 7

5 years ago
I mentioned in my first post the extreme condition to launch firefox without explorer.exe running,
in order to help the troubleshooting, to cover all cases.

Yes, of course, normally explorer.exe is running all the time, it's the shell.
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