Bookmark managers being a separate application is a brilliant idea. Like password managers, they can be full blown standalone applications, with lots of functionality and variability.

I wish Firefox and others had good IPC for external applications to function as bookmark manager, password manager, etc. Browsers can then focus on being browsers, and we have have a variety of external bookmark managers exploring different design ideas, or focusing on different workflows.

For sure! I briefly looked into integrating more with browsers, for example, to better what's currently opened in different windows. But so far the only way I found was to rely heavily on macOS accessibility API to get some bi-directional data flow between the browser and the external app.

Or alternatively try to do this kind of integration via a browser extension. I know Raycast is doing something similar with their browser extension, when the extension acts as a proxy between the app and the browser to deliver different context to the app