Browser extensions like Honey are usually safe, but there is a potential for abuse. These extensions can include malware, and they are also capable of collecting your private data for various purposes. In the specific case of Honey, it appears to be totally safe.
What Is The Honey App, and Can It Really Save You Money? - Lifewire
www.lifewire.com > honey-app-4171926
To use Honey's coupon feature, just put things in your cart as usual. When you're ready to checkout, Honey's browser icon will light up, showing you a button to apply coupon codes. Select this, and Honey will automatically run through every coupon code in its database to see if any of them will work.
Your beginner's guide to Honey, the anti-Amazon shopping extension
thenextweb.com > honey-shopping-extension-browser-beginners-guide
Just shop like you normally do on your favorite sites. Honey works on 40,000+ top stores like Macy's, J. Crew, Lowe's, Adidas, Stubhub, Ulta, Target, Sephora, GameStop, Nike, Target, and Pizza Hut. We even find deals on Amazon.
Get to know the Honey browser extension - Honey
help.joinhoney.com > 39-what-is-the-honey-extension-and-how-do-i-get-it
Honey currently supports shopping sites in the United States, Canada, Australia, United Kingdom, and more.
Honey on international sites - Honey
help.joinhoney.com > article > 51-does-honey-work-on-international-sites