Эм. Ну, я имел в виду Maximize и Restore Down.

I just did some testing.  I opened two browsers, one without this patch, and one with it (changeset 72249:b7f03b37cf0c).  I used two separate but identical new profiles, and did a bunch of browsing with the two browsers side-by-side.  All the actions I did in the first browser and then immediately in the second browser.

- Opened about:memory?verbose
- Opened http://videos.mozilla.org/serv/mozhacks/flight-of-the-navigator/
- Opened http://v8.googlecode.com/svn/data/benchmarks/current/run.html
- Opened http://gmail.com, opened a few folders and emails
- Opened http://techcrunch.com, rolled over all the stories, opened a few, tabbed through them
- Opened http://www.cad-comic.com/cad/
- Opened http://www.businessinsider.com, opened a few stories, tabbed through them
- Close all tabs except about:memory?verbose
- Refreshed about:memory?verbose
- Clicked "minimize memory usage" three times.

Start-up (both browsers were similar)
-------------------------------------
40,702,558 B (100.0%) -- explicit
├──20,727,114 B (50.92%) -- heap-unclassified
├──15,084,679 B (37.06%) -- js
...
│  ├─────172,224 B (00.42%) -- gc-heap-chunk-unused
...
  7,340,032 B -- js-gc-heap

After closing all tabs, but before minimizing memory usage, without patch
-------------------------------------------------------------------------
506,326,510 B (100.0%) -- explicit
├──262,992,556 B (51.94%) -- js
│  ├──224,271,616 B (44.29%) -- gc-heap-chunk-unused
...
  239,075,328 B -- js-gc-heap

After closing all tabs, but before minimizing memory usage, with patch
----------------------------------------------------------------------
454,850,070 B (100.0%) -- explicit
├──213,958,387 B (47.04%) -- js
│  ├──176,048,704 B (38.70%) -- gc-heap-chunk-unused
...
  189,792,256 B -- js-gc-heap

After minimizing memory usage, without patch
--------------------------------------------
194,560,122 B (100.0%) -- explicit
├──124,508,206 B (63.99%) -- js
│  ├───97,605,824 B (50.17%) -- gc-heap-chunk-unused
...
  108,003,328 B -- js-gc-heap

After minimizing memory usage, with patch
--------------------------------------------
105,101,674 B (100.0%) -- explicit
...
├───37,379,477 B (35.57%) -- js
...
│   ├──12,237,056 B (11.64%) -- gc-heap-chunk-unused
...
   20,971,520 B -- js-gc-heap

With the patch applied:
- prior to minimizing memory usage, the JS heap was about 40MB smaller (1.26x)
- after minimizing memory usage, the JS heap was about 80MB smaller (5.15x)

And this was a short browsing session.  It's possible the improvement could become even greater over a longer browsing session.

A 5x reduction in JS heap size is just ridiculously good;  we have to get this in to FF7.

Только что приземлили Bug 666058 - Don't share chunks for system compartments - ещё один патч, серьёзно сокращающий потребление памяти.

Я в смятении