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Apple is finally allowing Firefox to use its own engine on the iPhone (but only in the EU)
(www.theverge.com)
A place to discuss the news and latest developments on the open-source browser Firefox
The regulations outright stated that it has to be allowed. So they knew it was going to be allowed on iOS. Like I said, the only question was how: Mozilla didn't know what the mechanisms made by Apple to make this work would look like, but that can be worked out fairly easily later, once they have a working build.