The numbering must be continuous. Hence, page 2 would include footnote #7. This being said, some authors start over the numbering whenever a new chapter begins.
Keep in mind that Ibid., Idem., loc.cit. and op.cit. terminologies cannot refer to footnotes that were included to previous chapters (if you decide to use a per chapter numbering method). On the other hand, you could decide to use continuous numbering from the start to the end of your document (that’s what I usually do). The ultimate decision is yours; both methods are acceptable.