updated version
added support for new private browsing mode
use tab id if available
remove data from private browsing windows
disabled private browsing due to platform restriction

https://wiki.mozilla.org/Labs/Jetpack/Release_Notes/1.14#Per-window_priv
ate-browsing
added support for new developer tools
Merge pull request #2 from sdstoehr/1.2.2

1.2.2