Besides the browser extensions/addons mentioned above (that sometimes either don't work for me or gets disabled on my machine) I also use/used to use xdotool (o

Besides the browser extensions/addons mentioned above (that sometimes either don't work for me or gets disabled on my machine) I also use/used to use xdotool (on Linux). You can do: `sleep 3 ; xdotool type "yourpassword here"` and then navigate to the field you want to have it typed into.