fix full path
now firefox default tool can download multiple files
add an option to hide middle folders
do not overwrite existing file
add a warning message for file rename
use tree view
allow user to clear saved user and password in widget menu
improve session check (but still may fail in some cases)
list tasks in a simple panel
rotating refresh button during refresh
fix footer in bottom
fold pages when there are too many
handle the case that current page out of range
reserve enough width for footer
move refresh button to left