Chrome browser to notify you when an extension is removed from the Chrome store:
Google is testing a new feature in the Chrome browser that will warn users when an installed extension has been removed from the Chrome Web Store, usually indicative of it being malware.
An unending supply of unwanted browser extensions is published on the Chrome Web Store and promoted through popup and redirect ads.
These extensions are made by scam companies and threat actors who use them to inject advertisements, track your search history, redirect you to affiliate pages, or in more severe cases, steal your Gmail emails and Facebook accounts.
The problem is that these extensions are churned out quickly, with the developers releasing new ones just as Google removes old ones from the Chrome Web Store.
Unfortunately, if you installed one of these extensions, they will still be installed in your browser, even after Google detects them as malware and removes them from the store.
Kudos to Google on this but it's a little surprising that this wasn't in from day one. And the fact that they did this makes you wonder just how big a problem this is. My take is "big".
And as to extensions, remember Borepatch's First Law of Security from back in 2008: "Free Download" is Interwebz-speak for "open your mouth and close your eyes."