This is mostly compatibility update for Firefox 14.
Fixes in 0.5a5.5.1:
URL bar clearing
Added widescreen support. So far only 4:3 screen format has been supported. From this release 16:9 and 16:10 are also supported.
Firefox 13 added new tab feature that prevented New Tab JumpStart from showing. That is fixed now.
Fixed click on bookmarks. Firefox 14 broke bookmark toolbar feature, that has been fixed now.
Fixed middle click and ctrl+left click functionality.
This is replacing Firefox’s new tab feature. To restore it uninstall or disable the extension and it will restore the former configuration.