User open web page with js timer who after some time open page on new tab.
User minimize firefox.
Can I create extension of firefox to miximaze browser on full screen after some url was opened on scripts timer in anothe page?
Is this possible?
I don’t entirely get your question, so let me answer this:
Can I put stuff in fullscreen from a timeout callback?
The answer to that is: No. You will (at least) get this error:
Request for fullscreen was denied because Element.requestFullscreen() was not called from inside a short running user-generated event handler.
You could look at using browser.windows.update() and setting the state to maximized?
I haven’t tried it myself. I think users might find it annoying if they didn’t trigger it explicitly.