Some userscripts for IMDB:
IMDB-score- Outdated because IMDB now provides this feature by default
- Shows the corresponding IMDB-score for each movie in the filmogrophy of an actor
- IMDB-average-season-score
- Calculates the average score for the selected season of any series
You need a scriptmanager like Tampermonkey or Greasemonkey installed in you browser.
Install the script either by clicking the hyperlinks below or download the script and add it to your scriptmanager manually.