add new system add-ons
add new system add-ons

add new system add-ons found here: https://ftp.mozilla.org/pub/system-addons/
kumar303/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,tsl143/addons-frontend,kumar303/addons-frontend,tsl143/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend