[kbenson]

I think you're talking about letterboxing, which Mozilla stole as a good idea from Tor a while back, and is gated behind the "privacy.resistFingerprinting" config option. It was covered here at the time.[1]

1: https://news.ycombinator.com/item?id=19323032

[floatingatoll]

"stole" is an unusual phrasing of "uplifted into Firefox": https://blog.torproject.org/tor-heart-firefox

[kbenson]

I figured someone might interpret that the wrong way. In my mind it was sort of a "Imitation is the sincerest form of flattery" mixed with "Good artists copy; great artists steal." I tried to allude to this with the "as a good idea" bit, so maybe it would come across as "that's a good idea, I'm stealing it!"

To summarize and clarify, I applaud their actions wholeheartedly. :)