I think a major difference is the update scheme. Browser extensions auto-update. If they switch hands there is no user visibility when getting the updated version. Pi-Hole is installed software and requires manual updates, which gives users more visibility and control.
you can turn auto-updates off. also, you can easily inspect the source for an extension (AMO doesn't allow minified js), you can't easily do that for the multitude of components that make up pi hole.
> you can't easily do that for the multitude of components that make up pi hole
What? The entirety of the project is open source. In fact it's easier to look at the source code that makes up PiHole because it's all in one spot in Github.
