Version 188.8.131.52810 - Fall season 2018
I'll most likely retire this in favor of a browser extension. Try it from here https://chrome.google.com/webstore/detail/anitrakt/ipmbpjbcmdmdhjiijcdjbjkpikpidflm.
This userscript will add a link to Myanimelist.net on a known movie/show.
Disclaimer: I can only provide limited support as I'm not well versed in JS. It will initially set the data which might take a second, afterwards it shouldn't be noticeable. I'm not sure what the best way is to keep the index updated, for now I'll push a season indicator to force an update.
Known entries (index) can be found at http://txm.huere.net.