Strace confirms my suspicion. Iceweasel does only look into the locale/en-US directory, but not into the locale/de one:
$ strace iceweasel 2>&1 | grep searchplugins access("/etc/iceweasel/searchplugins", F_OK) = 0 access("/etc/iceweasel/searchplugins/common", F_OK) = 0 access("/etc/iceweasel/searchplugins/locale/en-US", F_OK) = 0 access("/home/greffrath/.mozilla/firefox/0gqg222x.default/searchplugins", F_OK) = -1 ENOENT (No such file or directory) access("/usr/lib/iceweasel/browser/searchplugins", F_OK) = -1 ENOENT (No such file or directory) access("/home/greffrath/.mozilla/firefox/0gqg222x.default/extensions/tin...@ideeinc.com.xpi/searchplugins", F_OK) = -1 ENOTDIR (Not a directory) access("/home/greffrath/.mozilla/firefox/0gqg222x.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/searchplugins", F_OK) = -1 ENOENT (No such file or directory) $ locale LANG=de_DE.utf8 LANGUAGE= LC_CTYPE="de_DE.utf8" LC_NUMERIC="de_DE.utf8" LC_TIME="de_DE.utf8" LC_COLLATE="de_DE.utf8" LC_MONETARY="de_DE.utf8" LC_MESSAGES="de_DE.utf8" LC_PAPER="de_DE.utf8" LC_NAME="de_DE.utf8" LC_ADDRESS="de_DE.utf8" LC_TELEPHONE="de_DE.utf8" LC_MEASUREMENT="de_DE.utf8" LC_IDENTIFICATION="de_DE.utf8" LC_ALL= $ dpkg -l iceweasel\* | grep ^ii ii iceweasel 35.0-1 amd64 Web browser based on Firefox ii iceweasel-l10n-de 1:35.0-1 all German language package for Iceweasel $ find /etc/iceweasel/searchplugins/ /etc/iceweasel/searchplugins/ /etc/iceweasel/searchplugins/locale /etc/iceweasel/searchplugins/locale/de /etc/iceweasel/searchplugins/locale/de/google.xml /etc/iceweasel/searchplugins/locale/de/bing.xml /etc/iceweasel/searchplugins/locale/de/ddg.xml /etc/iceweasel/searchplugins/locale/de/amazondotcom-de.xml /etc/iceweasel/searchplugins/locale/de/wikipedia-de.xml /etc/iceweasel/searchplugins/locale/de/yahoo-de.xml /etc/iceweasel/searchplugins/locale/de/eBay-de.xml /etc/iceweasel/searchplugins/locale/de/leo_ende_de.xml /etc/iceweasel/searchplugins/locale/en-US /etc/iceweasel/searchplugins/locale/en-US/google.xml /etc/iceweasel/searchplugins/locale/en-US/amazondotcom.xml /etc/iceweasel/searchplugins/locale/en-US/eBay.xml /etc/iceweasel/searchplugins/locale/en-US/bing.xml /etc/iceweasel/searchplugins/locale/en-US/ddg.xml /etc/iceweasel/searchplugins/locale/en-US/wikipedia.xml /etc/iceweasel/searchplugins/locale/en-US/twitter.xml /etc/iceweasel/searchplugins/locale/en-US/yahoo.xml /etc/iceweasel/searchplugins/common /etc/iceweasel/searchplugins/common/debsearch.xml - Fabian -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org