A small update to the Chrome extension was published today. This only affects the encoding command generation. It has a better layout with some additional help texts about the different settings. Furthermore, the subtitle handling is a bit better with support for simultaneous de-interlacing and overlaying subtitles. Also, the possibility to include DVD encoded subtitles (separate subtitle stream in the file making it possible to turn on or off subtitles) is supported.
The updated should be automatically applied, but you can verify in the extensions list that version 4.4.4 is listed.