There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.

Accounts which solely post advertisements, or persistently post them may be terminated.

Cypher ,

This is true and also an issue for Firefox.

It is difficult to address, and if the extension isn’t open source you should be especially careful.

That said there are extensions with security reviews performed by the Mozilla foundation and you can see that on the extension page.

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