Make wikipedia the default and only search engine in the Unsafe Browser.

config/chroot_local-includes/usr/local/sbin/unsafe-browser

@@ -135,6 +135,26 @@ EOF
 
     # Remove all bookmarks
     rm -f ${CHROOT}/etc/iceweasel/profile/bookmarks.html
+
+    # Make the English wikipedia the only available and default search
+    # engine (this is a documented cue for identifying the Unsafe Browser,
+    # which is extra important in camouflage mode when the scary coloured
+    # theme is disabled.)
+    find ${CHROOT}/etc/iceweasel/profile/searchplugins/ \
+         ${CHROOT}/etc/iceweasel/searchplugins -name "*.xml" | \
+        while read searchengine; do
+            if basename "$searchengine" | grep -qvi wikipedia; then
+                rm "${searchengine}"
+            fi
+        done
+    sed -i '/^user_pref("browser.search.defaultenginename",/d' \
+        ${CHROOT}/etc/iceweasel/profile/user.js
+    echo 'user_pref("browser.search.defaultenginename", "Wikipedia (en)");' >> \
+        ${CHROOT}/etc/iceweasel/profile/user.js
+    sed -i '/^user_pref("browser.search.selectedEngine",/d' \
+        ${CHROOT}/etc/iceweasel/profile/user.js
+    echo 'user_pref("browser.search.selectedEngine", "Wikipedia (en)");' >> \
+        ${CHROOT}/etc/iceweasel/profile/user.js
 }
 
 run_browser_in_chroot () {