Add ability to open multiple tasks in a single Online Editor session

Our linguists in China have shared about the slowness of the Online Editor. They would like to load up multiple tasks at once so they don't have to wait for the Online Editor to load for each task separately. Opening multiple tabs of the Online Editor is not a viable solution as each tab consumes a license, potentially locking out other linguists, and each tab consumes 200MB or more of system memory which can lead to system crashes.