[BeautifulSynch]

Not a Firefox user, but this feels like a culture gap. I use multiple applications where configurability through user-code is part of the SLA, and dropping support would be as utterly unacceptable as, say, dropping the toolbar. Considering the contrast Mozilla is trying to make with Chrome's more restrictive and non-user-conscious nature I see no reason they wouldn't share that same philosophy.

Unless there's something I'm missing re: Mozilla's history/market-positioning?

[jwells89]

In the past they’ve not hesitated to reduce customizability when doing so was perceived to bring some benefit to ease of development.

Aside from that I just think it’s a good idea to push for implementation of basic functionality like hiding bars that don’t pair nicely with popular vertical tab extensions. I shouldn’t need to resort to usercss mods to do something that simple.