How do i set window size for Firefox?

For Chrome i set settings [‘args’, ‘[–window-size=1920,1020]’]. How this should work for Firefox?

That sounds like it could be a full-screen window so why not just use:


If you want to be more specific, you could use these APIs:

WebDriver driver = DriverFactory.getWebDriver()
driver.manage().window().setSize(new Dimension(
  width_pixels, height_pixels))

Thanks. Works great.

Firefox is opening in full-screen window for me all the time, I want to change it but same as OP it doesn’t work like for chrome with desired capabilites
[‘args’, ‘[–window-size=860,800]’]