Does Firefox "freeze" tabs that are in an inactive tab group to increase performance/save memory?

Tabs that are in a tab group but are otherwise not in focus occupy the same amount of memory as the tabs that are open. In all probability, this is inefficient. I realize Firefox handles all tabs as one process (as opposed to Chrome's single-process-per-tab), but is there anyway within Firefox's framework to freeze these hidden tabs and unfreeze them when they're in focus? It seems like it would speed things up considerably.
Still, I LOVE Firefox 4 and have been using since Beta 7. Thank you! :)

Hi.
This is about a question you posted to the Firefox Support forum three months ago (I'm sorry you never got an answer).
Did you ever fix the problem where Firefox freezes or hangs, when clicking a download link or using (File menu) "save as" or "open file"? Or when going to the Firefox (Tools) menu and clicking Options ? Or trying to Import or Export bookmarks?
I found this thread searching for a solution for someone on MozillaZine's support forum who's having a similar issue. See this thread: (maybe something he's tried that didn't work for him will work for you?)
http://forums.mozillazine.org/viewtopic.php?f=38&t=2382953&start=15
<br>Cannot download or click tools -> options

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