Alt-Up/Down should cycle through the one-off buttons. For some reason on Linux, you have to press Shift-Alt-Up/Down. I don't know whether that's always been the case or whether we (I) broke it recently. Simona, do you think you could get a regression range? If it is a regression, it's probably due to bug 1180944 or bug 1295458. Since I'm not sure yet, I won't mark this blocking a particular bug yet.

(In reply to Drew Willcoxon :adw from comment #0) > For some reason on Linux, you have to press Shift-Alt-Up/Down. I can't see why that should be the case, looking at the code, by the way.

On Firefox 51 (Build ID: 20170116133120), I see the same behavior as on the latest Nightly 55.0a1 (Build ID: 20170509100208) - navigation in the one-offs bar can't be made using just Alt+Up/Down (works with Shift+Alt+Up/Down). I went back to Firefox 49.0.2 and Firefox 34 and the navigation in the search one-offs bar (in the search bar) is made also using Shift+Alt+Up/Down. This leads me to believe that the keyboard navigation in the one-offs bar was designed this way. Drew, what is your opinion on this?

Thanks! It's good to know it's not a recent regression. I haven't poked around on Linux with this specifically, but just being familiar with the code, I don't see exactly why Linux should behave differently. It's worth investigating and fixing probably, but since it's not a recent regression, probably not a high priority. ... although if it's always worked this way on Linux, maybe we shouldn't "fix" it!