WindowEventHandlers.onbeforeunload - Web APIs | MDN developer.mozilla.org/en-US/docs/Web/API/WindowEventHandler… 2020-02-29
The onbeforeunload property of the WindowEventHandlers mixin is the EventHandler for processing
MDN Web Docs developer.mozilla.org/en-US/ 2020-02-29
Resources for developers, by developers. Web Technologies
Native messaging - Mozilla | MDN developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensi… 2020-02-29
needing to be reachable over the web. One common example here is password managers: the native
Browser Extensions - Mozilla | MDN developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensi… 2020-02-29
a web page Add a button to the toolbar Implement a settings page Interact with the clipboard Work
Responsive Design Mode - Firefox Developer Tools | MDN developer.mozilla.org/en-US/docs/Tools/Responsive_Design_Mo… 2020-02-29
menu: Select "Responsive Design Mode" from the Web Developer submenu in the Firefox Menu (or Tools menu
Document.currentScript - Web APIs | MDN developer.mozilla.org/en-US/docs/Web/API/Document/currentSc… 2020-02-29
The Document.currentScript property returns the