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Summary:

Jetpackers hate mid-air collisions more than anyone.

This Jetpack monitors bugzilla.mozilla.org bugs for changes in the background to help you avoid a mid-air collision before it happens. For each bug you're viewing the code spawns an interval timer to check if the modified time of the bug has changed before you submitted your changes. If the bug has changed in the background a notification is placed above the comment area to warn you that
you're headed for a mid-air collision.

See the release blog post The Pattern is not full

Here's an example of a mid-air collision that could have been avoided.

If only you had a little warning before you submitted your comment.

Jetpack, a new project by Mozilla Labs, a new way to extend Firefox on tools you already know: jQuery, Firebug, JavaScript and HTML

Userscripts.org is excited to see how Jetpack evolves. If you have ideas on how we can better support Jetpack, join us in our Jetpack forum.