I followed the link logged in to Google, in a private window and through a VPN in another browser. The results were the same and in the same order in each case: Firefox addon, uBlock.org, Gorhill's Github, Wikipedia, MS store, Reddit, Twitter and the Opera addon. The Chrome addon doesn't show up until the top of the 3rd results page.

The suggested searches were for adding every major browser apart from Chrome to the search.

If you add Chrome to the query then uBlock for Chrome appears as the top result.

Seems kind of a strange failing that Google search needs such a specific query to get a result for a chrome addon that their own store page claims has over 10 million installs.