How to uninstall greasemonkey from firefox (mac)?

Today i have installed greasemonkey because my friend told me it was a good complement for firefox, but now ads appears on every page I go to and I want to delete it but there is not any delete or uninstall option.
If someone could help me and write how to delete it, I would be very gratefull.

Greasemonkey can be uninstalled like any other extension. In the Add-ons Manager, Extensions category, click the Remove button next to it.
* [[Disable or remove Add-ons]]
That being said, Greasemonkey has nothing to do with ads appearing on web pages, unless you installed untrustworthy user scripts.

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