Bug 993901 - Implement logic to decide when to fetch remotely hosted links [r=adw]
Download links file if it's been a day on init, new tab load, or pref change.
Bug 993904 - Use cached directory links instead of locally packaged links [r=adw]
Read in the local file instead of fetching the packaged file.
Merge m-c to f-t
Bug 454520 - fix caret browsing dialog to default to no and remember choices, r=jaws,f=dbolter
merge fx-team to mozilla-central