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The Persist feature has been available in Firebug for some time already, but I recently got several questions indicating that it doesn't have the visibility it deserves. So, let's introduce it quickly.

Firebug UI resets every time the current browser tab is refreshed or navigated to another page - to show the new state. The consequence is that all Firebug panels trash the content (i.e. the Net or Console panel entries are lost).

This is fine since usually the user doesn't want to keep the entire history. But what in the case when you want to debug the transition process between page loads or redirects?

And this is exactly when the Persist button becomes practical...

The Persist button