Calm down guys it hasnt gone completly!
1. You need to enable the Develop menu (Safari Preferences > Advanced > Show Develope Menu)
2. A menu named 'Develop' will appear next to 'Bookmarks'
3. Click it and then click 'Show Page Resources'
And there you go! And can i just point out - Safari 6 in Mountain Lion is a massive improvment and any one who thinks that Mountain Lion is a downgrade from Lion hasn't properly checked their facts.
if you're not even going to read the post above your own, or rest of thread for that matter, please don't chime in with useless information. "Page resources" is only useful for just that, finding/accessing page resources, NOT activity. that window tells you nothing of server activity. Just because some of the people are using activity window to find page resources doesn't mean that's ALL it's used for. there are web developers and power users who actually used the activity window for ACTIVITY and that's not what page resources is for, not even remotely.
I'm not a dev, so don't get mad if I'm wrong, but doesn't the little clock tab show stuff as it's being loaded? Here's a screenshot of this very page when I refreshed it:
And this page tab to grab files:
Where has the Activity Window gone in Safari 6.0?
OS X Mountain Lion
Well it seems this original question may never be answered unless someone from Apple can graciouse us with an answer.
I have found my answer to solving the problem encountered by its disappearance. Namely that of downloading those little film bits for later viewing. Hardly illegal i would think.
As for others it appears from their comments, that the activity window held other uses and importance.
This thread is now up to page 7 i believe and the original question seems unanswerable.
Any comment Apple?
I used your process to try and save a Youtube video and was not able to do number 1, because I didn't completely understand it.
I did the rest and got all the way to the Movie playing in a separate tab. Once there I right click on the video but don't see the Save options you listed.Instead, "Inspect Element" appears.
Can you help me out?
Look at the screenshots on page 2 and 3 of this thread.
If you read through all this thread you will learn a huge amout about this subject.
Read through the thread and if you still can not achieve your goal post again.
If you discover something new on your endeavours please post your findings for us.
Please also keep in mind that i am no expert in this area. I simply acted upon someone else who posted...
"Seek and ye shall find". and holy s--- i did.
Did you install the Safari extention i mentioned?
If you read the thread you will see someone else pointed out to me this was not needed.
although it would give you the option to right click on the movie to get the little sucker.
Someone else mentioned a cool little add-on for adding a download button to the viewer itself.
Yet another pointed out the keys for the pages of the inspector... Cmd1 etc etc etc
Read the thread!
For those of you who presumably used Activity in pre-Safari 6 as I did, try the following:
1) From Safari 6, turn on the Developer tab by clicking the checkbox in Preferences | Advanced
2) Keyboard: Option-Command-A or Option-Command-I (either seems to bring up the same window)
3) If you're on a page with an embedded video, click the "Other" item in the left-hand Nav
4) Say your looking for an FLV file, you should find it in the list there
5) Dbl-Clicking it has the same behavior as it did from the the old Activity window
And I empathize with EVERYONE here and mourn the loss of a wonderful feature that is now buried deep within the Developer innards...
C'mon, Apple! Wake Up! Don't blow your shot at browser greatness!!