Migrating Popup ALT Attribute from XUL/XPCOM to WebExtensions Today’s post comes from Piro, the developer of Popup ALT Attribute, in addition to 40 other add-ons. He shares his thoughts about migrating XUL/XPCOM add-ons to WebExtensions, and shows us how he did it with Popup ALT Attribute. You can see the full text of this post on his personal blog. *** Hello, add-on developers. My name is YUKI Hi