This is a very hard sell. As a potential user I'm being asked to abandon my free browser that I trust and exchange it for something that costs money where I wou

This is a very hard sell. As a potential user I'm being asked to abandon my free browser that I trust and exchange it for something that costs money where I would lose access if I stopped paying. I think conceptually what you're building has a niche worth pursuing (productivity focused, project based navigation of the web) but it's going to take a lot of thought to make that more compelling than installing free extensions on an existing browser. On reflection if the core functionality (organising projects/bookmarks as a key part of the browser experience) was made into a paid browser extension I'd be more likely to consider using it.