Hi, I set up the vertical tabs and I like them. However they're very unstable and so is the tab sidebar. The expand on hover feature only works for a short time. Then the x to close a tab disappears and the sidebar gets stuck open or closed. If it gets stuck open, it covers the settings and AI and history sidebars so I need to close it manually to use them. Yesterday I lost 3 of my 6 pinned tabs. After closing and opening FF, they were just gone. Also my tab groups will suddenly disappear. This started in the previous version and still happens, and I lose the sites I had collected. Plus FF has been very slow to load. So yesterday I gave up and reverted to horizontal tabs. Like magic FF suddenly worked perfectly and very fast. I'm not enough of a techie to have any idea of what is causing what and would really appreciate any advice.