Don't show the upgrade button if the remaining days of subscription are more than 7 days

[lipis]

It's a bit annoying to see this button all the time there especially when someone actually upgraded the account and there are plenty of days left in her subscription..

7 is an arbitrary number and it could be maybe probably a bit more or less.. but it shouldn't be more than 14..

---

I paid for a year but unsubscribed just not to forget about it because my plan is to deploy on my own account and experiment with Go.. but you're totally worth it so I wanted to give something back before doing so.. :)

[kofalt]

Alternately: https://addons.mozilla.org/en-US/firefox/addon/elemhidehelper