Temp Mail - Disposable Temporary Email by Privatix establishes a persistent, full time outbound insecure port 80 connection to a service hosted by Worldstream in the Netherlands.

The extension's landing page Temp Mail dot org is hosted by the Russian reg dot com and uses port 443. Temp Mail's core function can be accessed here without the use of the extension.

As well as making use of Google hosted libraries, Temp Mail dot org itself connects to several of the usual advertisers, trackers and analytics, which is to be expected.

The extension will "Keep your real mailbox clean and secure," but the same cannot be claimed about its methods out there on the Web. Privatix should not be singled out for that methodology.

Privatix's approach to "secure" has several facets, some of which aren't.

While this review is not presented as an indictment of nefarious schemes, the methods should be disclosed in "About this extension."

All that said, Temp Mail - Disposable Temporary Email works quite well.

First of all, the web version is great, thanks.
But add-on doesn't add anything useful, opening tab is really better than working with add-on, because there is no enough options as web version.