no edit summary
[[Dive into Mozilla]] > [[Dive into Mozilla Day 5]] > Modifying Firefox using an Extension Lab
Start your browser and make sure your extension is loaded (check '''Tools > Add-ons''') and working properly by creating some tabs to see where they get positioned. If you're having problems, check the '''Error Console''' ('''Tools > Error Console''') for hints.
First Attempt== ==Second Attempt== ==Third Attempt==
==Success, and some bugs==