You can just put bookmarks in folders.
Pretty sure that's a been a feature of nearly every browser I've used since Netscape.
Nowadays you can use whatever context menu to open all bookmarks in a folder in tabs.
Firefox
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Bookmarks are very clunky to use. Plus now as you close the tabs, you need to delete the bookmarks or move them to the "done" folder. Very labour intensive and flow breaking. I really wish there were something better.
Firefox mobile:
- 3 dots (...)
- Bookmarks
- 3 dots on the folder you wanna open
- open all in New tabs (or choose private tabs if that's your thing)
My guess is you're trying to open tabs by opening the tab manager (square icon with number in it), adding an empty tab, then go from there?
That would bring you to the "home" tab or whatever they call it... a mishmash of a small number of favorites and recent stuff, and yea that's kinda convoluted.
In your case, you know you wanna open a bookmark, go to bookmarks directly from your current tab (... menu/bookmarks), then just use open in new tab from there.
Open in new tab works on single bookmarks and to open all bookmarks within a folder.
The issue with bookmarks is that it takes too much navigation to open one and browsers don’t allow to select multiple in a folder to open
Nowadays you can use whatever context menu to open all bookmarks in a folder in tabs.
Re-read this.
A bookmark folder called "Read Later"
I know you said you're not looking for a Pocket like solution but honestly it's the best solution for your problem. With tabs you might lose it all when the browser crashes and for some reason you're not able to restore the session. If you don't want to use cloud based solutions like mentioned before, check Linkwarden which can be selfhosted.
/edit typo
Firefox has "Collections" I believe. And you can sync them between all Firefox instances you're signed in to.
Collection are not synced between devices
If I’m not mistaken, are you referring to Tab groups or tab stacks (Vivaldi has that feature)? If yes, then that’s one of the best must-have features. I wish Mozilla would bring that to Firefox.
Sounds more like vivaldi's sessions
Personally, I would use Nextcloud Bookmarks and/or Wallabag.