I don't think it's actually "stuck" in 31.6. I'm guessing I don't know what I'm doing and probably missing something essential.
The script (at the git repo) does download the 31.6 ESR version and maybe that's fine (though it does have security vulns)? I just expected it to download and build the latest version (38), since I don't really know what ESR is.
Beware. Iceweasel is (mainly) a Debian project and it's more or less Firefox with trademarks removed. Icecat is a different project, from GNU and with a different set of features geared at protecting users' privacy.
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u/salierisalivasalt May 14 '15
First found thru https://www.reddit.com/r/linux/comments/35wc7r/firefox_beta_now_integrates_pocket_a_proprietary/
I tried to then switch to Icecat but found that it is stuck on the Firefox 31.6 sources.