Rollback is a reverse engineered version of the usergroup action, allowing you to rollback pages whether you are in the usergroup or not.
It will not take precedence over conventional rollback if the user already has the permission.
Wikis may not allow the usage of this script. If you are an administrator on a wiki and want to disable the script, you should create an abuse filter which prevents users rollbacking without being in the usergroup. This could be achieved by checking if the user is in a corresponding group with the right (e.g. rollback, sysop, VSTF) when an edit summary is "Reverted edits by".
Note: In this example, pay close attention to the placement of commas and other punctuation. For people who aren't familiar with programming (and even those who are!), a common mistake when writing code is to accidentally delete, forget, or misplace critical symbols like commas or quotation marks. This can cause a syntax error that breaks the code. Carefully follow the convention shown here when using importArticles.