I got a Galaxy s25u and used samsung smartswitch to transfer data from my s24u.Firefox and all it's bookmarks history and passwords have synched but my open and inactive tabs have not transfered. 2 years ago I used samsung smartswitch to transfer data from a xiaomi mi10 pro to a Galaxy s23u and firefox open and inactive tabs were transfered. Last year I got a Galaxy s24u and used samsung smartswitch to transfer data from the s23u to the s24u. Again all my inactive and open tabs I'm firefox were transferred. I can still see inactive tabs from 2 years ago that I opened on my s23u on my s24u but I cannot see those same tabs on my s25u. Also if I sync I can see the tabs in synced tabs but after an hour synched tabs is empty. I've had my Galaxy s25u for 6 weeks and I need to sell my s24u but I cannot because I do not want to loose all my tabs. This is costing me a lot of time and money. I also recently closed firefox on my pc (using a different firefox account to my android device) behind the main window was another open window which I then closed. This means that the entire 200 tab session is lost as firefox only has one restore point that overwrites immediately, "restore previous session" no longer exists and tab the tab session manager add on has not worked for 4 years. Mozilla is not my favourite company at the moment.