(FF 50) Listed Twice in Task Manager

[Ortho_Fan]

I just updated to FF 50.0, via the help menu, and noticed that there are now TWO listings in the Windows Task Manager under Processes -- one, Firefox.exe(32) at 225,834 KB; one Firefox.exe(32) at 43,180 KB. Under the Task Manager's Applications tab, only ONE instance of Firefox is running.

I know for a fact that there was only one listing for FF prior to the update because I had the Task Manager screen (set to display always on top) open to check something else out.

I tried restarting Firefox in SAFE MODE, but the results were the same--two instances listed in running Processes.

I see no issues involving hangs or problems closing out Firefox. Both instances immediately disappear from the list when I exit Firefox. Also, there are no issues reported in FF Crash Reports, etc.

Is the double listing by design, or is it a possible bug? Any other FF50 users see this happening?

OF

[LIMPET235]

Moving to Firefox Builds...

[Josa]

Firefox 50 from the release channel?
What's the value for Multiprocess Windows on about:support?

[LIMPET235]

I missed that v50 has been released.
Back to Support...

[Ortho_Fan]

Firefox 50 from the release channel?
What's the value for Multiprocess Windows on about:support?

The value I see listed for Multiprocess Windows is: 2/2 (Enabled by default)

Yes. I clicked on the Help Menu this morning, I clicked on About Firefox, and Firefox 50.0 automatically downloaded.

Oddly enough, I just checked https://www.mozilla.org/en-US/firefox/new/ and it says' I'm using a pre-release version of Firefox, so I don't know what's going on.

OF

[Josa]

It just got released... that page should be updated today.
The value (and what you're seeing on Task Manager) means that Firefox now uses 2 process - one for the UI and one that deals with the content of the pages. If some page make Firefox crash, you now just have to reload the page, because the UI process will remain fully working.

[Ortho_Fan]

Hi Josa:

So it IS by design. Many thanks for letting me know. Once less thing to fret over.

OF

[omeringen]

What's the difference between 1/1 (Enabled by default) and 2/2 (Enabled by default) ?
Are there anothers like 1/2 etc. ? Is there any list about explaining all values ?

[Josa]

X/Y
X = number of windows running in a different process
Y = total of windows

As far as I know, they're always the same.
He got 2/2 because he had 2 windows opened at the moment.

[omeringen]

Thanks for the explanation.