Update aboutTrackers require()s for SDK 1.15 to avoid warnings/deprecation-removal.
Bump about:trackers version to 3.
Update aboutProfile require()s for SDK 1.15 to avoid warnings/deprecation-removal and clean up unneeded requires.
Bump about:profile version to 3.
Closes #673: LessChrome not working in Firefox 29
Only try changing TabsOnTop for older versions of Firefox
Bump LessChrome HD version to 8 and maxVersion to latest Nightly.