Issue 342 - Speed up options page with many user filters on Safari

--HG--
extra : rebase_source : df504791c2cba55b5bc6ceed6553c1b7366baed5
Issue 343 - Fix element hiding in Chrome 35

--HG--
extra : rebase_source : 18cae8c2725ba0b79c10fcdf740067e10895c0ac