Remove page tab wrapping

[oliverfoster]

Subject of the issue

Tabbing off the end of the document should return the user to the address bar.

Steps to reproduce

Turn on accessibility mode.
Tab off the page.

Expected behaviour

Tabbing should reach address bar.

Actual behaviour

Tabbing loops to page top.

[oliverfoster]

This may still need to be on for popups. Will try and find sources for reference,