firefox: fix p-h #33, remove restriction on extensions.

helpers/make-firefox

@@ -51,6 +51,7 @@ sed -i '/activity-stream.showSponsored/s|true|false|g' browser/app/profile/firef
 sed '/"browser.privatebrowsing.vpnpromourl"/s/https.*"/"/' -i browser/app/profile/firefox.js
 
 sed '/network.connectivity-service.IPv/s/http.*success.txt?ipv[46]//' -i modules/libpref/init/all.js
+sed 's/accounts-static.cdn.mozilla.net.*sync.services.mozilla.com//' -i modules/libpref/init/all.js
 
 # do not alter useragent/platform/oscpu/etc with fingerprinting countermeasure, it makes things worse
 sed '/ShouldResistFingerprinting/,/}/s/^/\/\//' -i ./netwerk/protocol/http/nsHttpHandler.cpp