Ranked in these QuestionsQuestion Ranking
Pro Tabs Outliner is great at organization of tabs
Even though the experience is not streamlined, it's still worth checking out.
Pro Reliable, trustworthy and safe
Has barely any problems (on Windows and Linux), help from the developer easy to get.
Pro Powerful - interface and learning curve can seem like a lot but they're not and serve you well
Pro Add notes and labels to any groups, windows and labels
Lots of organization functionality and freedom. You can use emojis as group icons too. You can also duplicate anything.
Clumsy and complicated interface.
Con Can't search old trees (files) without opening them individually
Con Need to start a new 'tree' (file) when it becomes too big for performance
Thankfully it's gonna take a long time before you need to start over (many months even for those using a very old laptop and browsing throughout the day) and you can bring content from your old trees into new ones (old trees can be stores locally or in Google Drive btw).