How safe are Firefox addons from official mozilla.org site?

The accepted answer is out of date.

As of October 28, 2017 Firefox FAQ states a different view (note the "may"):

Are add-ons safe to install?

Use caution when installing add-ons, as they could harm your computer or violate your privacy. Add-ons available from this site may be subject to review by Mozilla's team of reviewers, and user feedback is closely monitored, so they should generally be safe to install.

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Firefox

Malware

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