Killing userChrome would be extremely on brand for Mozilla, so I'm sure it will happen at some point. Killing features beloved by a subset of power users appears to be a guiding design principle there. I've seen userChrome suggested as the fix for all kinds of UX regressions that Firefox pushed on users. But if Firefox is willing to go out of its way to break the UX in various ways, why would I ever trust it to maintain that support?
Of course people are going to find ways around it, simply because the alternatives are still so much worse, but it definitely disappoints me to see that we have to be fighting this constant war with the developers at Mozilla who are continuing to oppress users while thinking that they're doing the right thing.
