Just updated to macOS 11 "Big Sur", macOS 12 "Monterey", or newer? You may have noticed some of the apps in your Dock look a bit inconsistent with the rest of the system.
Replacicon makes it easy to find, change, and replace app icons on the Mac. It scans online sources containing thousands of replacement app icons for each of your installed macOS apps and shows them all to you in one place.
In just a click, you can change your third-party app icons so they better match the rest of the system, or your own tastes.