thunderbird: fix sandstone layout and style
thunderbird: update related links
sandstone: add missing download images
sandstone: Thunderbird responsive layout
Sandstone: add IE fix for menu bar
Tabzilla: remove 404 Open Sans font link to mozilla.org
sandstone: remove os_detector to reduce unknown error, switch ga to universal analysis
Thunderbird: beautify
Merge branch 'refs/heads/thunderbird-sandstone'