It's definitely interesting to see how people's workflows can be so different, I get by with at most ~10 tabs, and close things as soon as I'm done with them. At the end of the working day, I prefer to have at most 2 or 3 left. I sincerely start to experience existential anxiety when the number of tabs goes up too much :-P. Probably related to some subconscious feeling that I need to 'do something' with all these tabs and when they increase in number it starts to feel like I'm 'running behind'. Different people, different workflows, that's perfectly fine.
What I don't really see is why this service needs to exist to solve that particular problem (browser gets slow because too many tabs), because IMO that problem has already been solved very well by most decent browsers. They just swap out the inactive tabs and are able to restore them fast enough even on low-end systems, as long as they have an SSD. Inactive tabs that are not swapped out don't take a lot of CPU resources either. This service sells you a cloud browser with 16GB of RAM, which is pretty much the norm for laptops and desktops now, so it's not going to save you much if 'too many tabs' is causing slowness.
I keep the things I need to do in a separate window. If it gets to crowded I drag some less important ones to a different window. I get anxiety when behind but also if I forget to live. Switching between topics effectively is hard if you are not used to it and it definitely eats away my focus if I don't pay attention.
For a while I use different browsers simultaneously for different things. The session turns out entirely different for some reason as if one is a different person in a different location. I could see a cloud browser as something like that. I have no idea what would happen. Portability will probably influence the session.
I wish bookmarks were good enough, I use tabs in stead to preserve scroll audio and video offset and to have a bunch of tabs for a domain with related tabs next to them. Browsers have poor organization for large numbers of tabs but bookmarks are even worse.
I have no real idea how the session should be organized but I'm sure there are tons of visualizations out there that would work wonderfully. Perhaps some filters with a flow chart for the entire browsing history. Full text search? I don't know.
The price doesn't really matter as I spend way to much time online. 1 euro per day is nothing.
What I don't really see is why this service needs to exist to solve that particular problem (browser gets slow because too many tabs), because IMO that problem has already been solved very well by most decent browsers. They just swap out the inactive tabs and are able to restore them fast enough even on low-end systems, as long as they have an SSD. Inactive tabs that are not swapped out don't take a lot of CPU resources either. This service sells you a cloud browser with 16GB of RAM, which is pretty much the norm for laptops and desktops now, so it's not going to save you much if 'too many tabs' is causing slowness.