Use of drawWindow method from CanvasRenderingContext2D is deprecated. Use tabs.captureTab extensions API instead https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/tabs/captureTab
Zaharkituta dago CanvasRenderingContext2D-ko drawWindow metodoa erabiltzea. Erabili tabs.captureTab hedapenen APIa horren ordez https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/tabs/captureTab