I felt like the Safari icons for Big Sur/Monterey had too much 'chrome', so I made new ones.
For both plain ol' Safari and Safari Technology Preview (in 🌚 & 🌝)
For Safari Technology Preview:
Since Safari Preview is user-installed, the icon can be replaced without any third-party apps.
- Open Get Info on Safari Technology Preview (right click the application in Finder)
- Drag and drop the .icns file over the current icon at the top-left corner
- That's it! Don't worry, you can always return to the default app icon by selecting the current icon in the Info window and pressing delete.
For Safari:
Here is my unsolicited plug for IconChamp. This is the only app I've found that can change the icons for system-installed apps like Safari in Monterey. It's not free, but I think it's awesome.
The only free work-around that I've come up with is to create a simple AppleScript to open Safari:
tell application "Safari" to activate
and export it as an Application, which can take the new icon using the same instructions above for Preview (Get Info > drag & drop the icns).