If you are planning to start developing a new Firefox add-on today, would you still use XUL / JS or would you start using Jetpack, the new add-in infrastructure?
The way XUL add-ons will continue to exist in Firefox 4, but Jetpack is clearly creating steam, and I think this will be the only way to create add-ons in the future.
Is it time to start searching / switching to Jetpack?
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