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Mozilla wants users to take part in a survey about browser features
(connect.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
That's how I treated it too. I took it at face value.
I have modern hardware so I don't care too much about browser performance. All browsers perform well on my hardware. Obviously some are more lightweight and optimised, but I have no doubts about my ability to comfortably browse the web on my hardware, so all the performance questions I tended to rank in the middle (ie not most or least important) as I don't tend to notice browser performance.