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Window.open()
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Window: prompt() method - Web APIs | MDN
Your second extension - Mozilla | MDN
Anatomy of an extension - Mozilla | MDN
PopupNotifications.jsm
Popup Infinite Slider Gallery Modal (HTML, CSS, JavaScript) | Part 2 of 3 - YouTube
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Firefox to hide notification popups by default starting next year | ZDNet : r/firefox
Debugging - Mozilla | MDN
Is there a way to disable "MDN References Intellisense" popup (for HTML & CSS) in VS Code? - Stack Overflow
if a program goes in to infinite loop than . than i loose my code that i write in mdn javascript online editor . · Issue #2225 · mdn/content · GitHub
Debugging | Firefox Extension Workshop
Using popup notifications
WebStorm 2017.3 EAP, 173.3188: better code completion and docs for JavaScript, new refactoring | The WebStorm Blog
