apt-get install iceweasel brings me a stable iceweasel (v30.0-2). You can always pull the one from experimental (v31.0-b3). But, have they fixed the bugs in the new version?
$ apt-listbugs list iceweasel
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
grave bugs of iceweasel (-> ) <Outstanding>
#704019 - iceweasel: Iceweasel Crashes upon loading pages using JavaScript
#674908 - [sparc] iceweasel: JavaScript crash on some sites
grave bugs of iceweasel (-> ) <Forwarded>
#703472 - iceweasel freezes in _MD_WaitUnixProcess after mailcap "test" command terminates
#709841 - iceweasel: spurious out of memory + crash (segmentation fault)
I have no more problems with Iceweasel from unstable, then I do using Firefox on openSUSE. Same version on different distros. I haven't experienced any of the bugs listed above.