Earlier, before FireFox 57, was such a cool addon, now everything is bad: - loads the processor to almost 90%, does not open tabs when i start FireFox, i must to disable and re-enable the add-on. Loads memory-from 2.5 to 6 GB (with twenty tabs). Locks pinned tabs periodically. I also agree with other users regarding the lack of functionality that was there before, and unnecessary semi-loaded tabs, tabs opening at the top of the list rather than at the end, problems with restoring tabs.. nothing works.