Wikipedia:User scripts/Most imported scripts/header
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The number of installations of a script is taken as the number of userspace common.js or skin js pages that contain the script's name (example search query). Commented-out installations also get counted, but the over-counting because of this should be negligible.
Note that a few scripts may have redirects, which indicates that they are also getting loaded for users who have installed the redirect version instead.
Active users are defined as users who have made an action in the last 30 days.
See also: Special:GadgetUsage, which is the equivalent page for gadgets.