User-agent:
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0
I quite agree, even if it is a user preference it would be fine, I would
choose to have multitasking when the screen is on. I find it rather
frustrating on slow connections to be unable to background the web
browser to let it load something while I check on other things.
