Take care when adding / allowing browser extensions ...

Some good reasons why you shouldn't pimp up your browser.

https://www.howtogeek.com/188346/why-browser-extensions-can-be-dangerous-and-how-to-protect-yourself/

While we're on the subject, this is a fairly useful article on a couple of extensions that might be worth having on your gmail account.

https://www.howtogeek.com/402035/the-best-chrome-extensions-for-making-gmail-better/