Is there a way to have a "watch later" or "favorite" list that works across different websites?

I often find myself browsing videos on different invidious instances or posts on various lemmy instances, and I would love to be able to create a "watch later" list or a "favorite" list that works across all of them. I don't want to have to manually import and export these lists between different instances, either, like I have to do on lemmy, invidious, etc.

I'm currently using a single bookmarks folder to keep track of everything, but I don't like this because it's a mess. I'd like to be able to create two or three different lists for different groups of websites, so that I can easily find what I'm looking for. For example, a favorite list for reddit, tumblr, etc, another favorite list and a watch for later list for invidious instances, and other lists for other sites.

Is there any way to achieve this? I'm open to using browser extensions, third-party apps, or any other solutions that might be out there. I would prefer a free solution, but I'm willing to consider paid options as well.

A bookmark can only exist in one folder at a time, whereas I want to be able to add a single item to multiple lists (e.g., both "favorites" and "watch later").

I believe the closest to what I'm looking for are Raindrop.io, Pocket, Wallabag, Hoarder, etc.

https://github.com/hoarder-app/hoarder?tab=readme-ov-file#alternatives

I use Manjaro Linux and Firefox.