Sandboxie and Firefox

[Fox Mulder]

Hi everyone. I've been trying to make Sandboxie play nice with Firefox but I'm having some issues.

I added firefox.exe to the forced programs list, as well as plugin-container.exe, and my flash player executable. I also checked off the recommended sandboxie options for running Firefox.

The problem is that when I load a flash video, it's often very slow to load and freezes the browser for up to 10 seconds. Sometimes when the flash video loads, I get the following error:

Application popup: FlashPlayerPlugin_11_3_300_265.exe - Application Error : The instruction at 0x6eff5e52 referenced memory at 0x6eff5e52. The memory could not be written.

Click on OK to terminate the program

I can click OK, reload the page, and the video works fine.

Anyone have any insights into this?

[pabrate]

I had the same problem with the latest flash player 11.3 , reverting back to 11.2 solved that problem.
In any case, it has nothing to do with Sandboxie.

btw you don't need to add plugin-container.exe and flash player executable to the forced programs, they will run sandboxed anyway if you force just firefox.

[Peter 123]

The latest versions of Adobe Flash Player (11.3.300.265 and before 11.3.300.257) are not fully compatible with Sandboxie. As far as I understand it has to do with the fact that the new Flash Player versions use by default an own sandbox ("Protected Mode").

My solution:
I deactived the Flash-Player-Sandbox as decribed here:

http://forums.adobe.com/thread/1018071?tstart=0

See the last part:

To disable Protected Mode, add the following line to your mms.cfg file located in:

Windows 32bit: C:\windows\system32\macromed\flash

Windows 64bit: C:\windows\syswow64\macromed\flash

ProtectedMode=0


If the mms.cfg file does not exist, create one using any standard text editor (e.g.. notepad)

Depending on your operating system, you might need to first save the mms.cfg file to a writable location (such as your documents or desktop folder) and then copy the file into the destination folder using Windows Explorer.

To re-enable Protected Mode, simply remove the line from the mms.cfg file.

Since I have done "ProtectedMode=0" the Flash Player works fine again within Sandboxie.

[pabrate]

Nice find Peter

Well, indeed, there's no need to have ProtectedMode in flash player enabled if Sandboxie is used

I think I'll upgrade the flash player and try it out with ProtectedMode disabled.

Edit : Just did that and it works like a charm

[Peter 123]

Originally Posted by pabrate

Just did that and it works like a charm

Good to hear that it works for you too. Thanks for your feedback.

[Fox Mulder]

It worked for me too. Thanks Peter!

[Peter 123]

You are welcome, Fox Mulder.

[operamail]

Had some crashes with the newest version of flash player, so I tried disabling its built in Protected Mode, but it seems no working for me. The flash player still crashes when I go watching videos on Youtube.

[Peter 123]

Originally Posted by operamail

The flash player still crashes when I go watching videos on Youtube.

It happened to me too (even with older versions of the Flash player).
I had to add the plugin-container.exe (= part of Firefox) to the programs which are allowed to start within the sandbox. Since this time I had no more crashes.

(In the latest versions of the Flash Player of course in combination with disabling the Protected Mode as described above.)

[operamail]

Did you use EMET, which seems to be the problem for me? I had EMET installed when the crashes happened. No more crashes since I removed EMET from my system.

[Peter 123]

No, I did not use EMET.