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Regarding #4, Microsoft doesn't allow competing browsers on Windows RT anyway. So even the users forced to use Metro would never experience Firefox's Metro mode

by yohui 13y ago

Regarding #4, Microsoft doesn't allow competing browsers on Windows RT anyway. So even the users forced to use Metro would never experience Firefox's Metro mode. As noted in the linked blog post: > At first, it looked like we would be locked out completely. We eventually broke open Metro (though never the RT line of ARM-based products) and we got to work.

sp332 13y ago
Unless I missed something, you're allowed to make browsers for WinRT, but for "security reasons" they disallow access to certain system calls that are necessary for a fast Javascript JIT. Only Internet Explorer gets to use those "private" system calls.
- JohnTHaller 13y ago
  That is a annoying, but a ton more open than iOS which won't even let you do Javascript at all. So, you're fored into to doing a UI skin atop the slower, non-JIT Mobile Safari renderer.
  - dottrap 13y ago
    This statement is completely untrue. - iOS forbids JIT just like Windows, making it no worse than Windows. - iOS 7 made JavaScriptCore public API so all iOS apps may use JavaScript. - Pre-iOS 7, companies were already embedding SpiderMonkey and their own forks of JavaScriptCore in iOS apps. This is allowed as long as JIT is off.