Wikipedia:Training/core/Grading tools

To make it easier to inspect many student edits quickly, you may want to enable some custom features (a user script) that let you see the details of an edit (ie, a diff) right from a watchlist, article history, or the contribution history of a user. To add these scripts, just press this button and save the page (the warning message about installing scripts is normal), then refresh your browser's cache (Ctrl + reload on Internet Explorer; Shift + reload on Firefox; simply reload on Chrome or Safari).

For users who have already created a vector.js page previously (most users have not), there is an extra step. If it isn't there, paste in this line before you save: