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does not seem to be open source. Why is it trustworthy of my entire browsing history?

You’ll want to get ‘Firefox Focus’ and then set the ad tracking on for safari.

Focus is designed to be a short use browser that deliberately minimises tracking, akin to fast access private browsing.

That said you only need to get the app to turn on their tracking protection which blocks ads on Safari.

Safari content blockers do not have access to your browsing history. It’s a declared list of patterns to block.