You will need to install a user script manager extension to install this script.
NOTE (2017/12/08): URLs no longer work, only IDs. If you have a list of IMDb URLs use this as regexp: (tt[0-9]+)
NOTE: Versions newer than 2.0 are broken in Chrome. Use 2.0 instead. If you need version above 2.0 then remove the "// @require" line. Open the URL on that line. Copy/paste the whole file contents under "var $ = jQuery;".
Inserts a small input box after a list in editing mode. IMDb IDs will be automatically added to the list. If you input titles the search is automatic but you must select the correct title manually.
To import ratings:
Make sure the format is: rating,imdb id/title
You can use the Regexp field to extract titles if your input is in a specific format. If the regexp fails it skips the entry.