Why did colorzilla disappear from my laptop and why doesn't Firefox allow it to download?

I used the zoom feature on colorzilla quite a bit, but now it's disappeared from my laptop. I googled colorzilla and got a link to www.colorzilla.com. The download link took me to www.colorzilla/firefox, and a "firefox prevented" notification appeared.
Is colorzilla not recommended by mozilla/firefox?
thank you

hello kmarble, this dialog is just a standard security measure that you can confirm and will show up on every third-party site which offers to install an addon - you can also download colorzilla directly from [https://addons.mozilla.org/firefox/addon/colorzilla addons.mozilla.org]...

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