Ref T4103. This removes these options:
The jump nav option came from T916, when we had a separate jump nav on the home page. Essentially no one has ever been confused by the behavior of search or disabled this feature. Here are the stats for this install:
|Have Set Any Preference||3084|
|Have Disabled Jump||6|
|Are Not "Security Researchers"||2|
|Any Account Activity||0|
The "/" option came in the same change, but the preference came from T989. This keystroke conflicts with a default Firefox keystroke. Almost no one cares about this either, but I count 6 real users who have disabled the behavior. I suspect the number of real users who use it may be smaller.
In Safari and Firefox, the "tab" key does the same thing.
In Chrome, the "tab" key does the same thing if Preferences → Web Content → "Pressing Tab highlights..." is disabled.
Upshot: jump nav is great, bulk of the change in T989 was clearly great, specific preferences that came out of it seem not-so-great and now is a good time to kill them as we head into T4103.