A userscript designed to assist in identifying possible spammers on Reddit.
Highlights usernames with less than x (30 by default) posts, since most spammers and account farmers only have a few posts. This will result in mostly false positives. However, if you're checking for spammers and see a flagged username, consider checking the user's profile for spammy behavior.
By default, it flags any user on Reddit. To limit it to specific subreddits, change https://*.reddit.com/* to https://*.reddit.com/r/<subreddit>/*. For multiple subreddits, use multiple @match lines.
Just click here and hit install. Requires Tampermonkey or Greasemonkey browser add-ons.
/u/Fortinbraz and this post for the bulk of the code.