Added: add cloneObject function in common_func.js.
Added: add the button to delete a item in a session.
Added: deepCompare function.
Deleted: compareObject function.
Fixed a few of the code.
Added: add the button to delete a item in a savedSession.
Added: add the button to delete a item in a history.
Changed: changed the order of warning message.
Changed the icon of a delete item in history and session.
Fixed the bug to don't correct behavior when cancel purged tabs if the release page is normal.
Fixed the behavior to delete item in a history.
Fixed a typo.
Fixed: When a session is updated, the bug that previous session is deleted by mistake.
Refactoring the codes.
fix a few of the code.