https://addons.mozilla.org/en-US/firefox/addon/tabs-aside/ looks like could be a candidate for you. But I don't know if it closes the tabs automatically after creating bookmarks. From the terminology "aside" I would assume its "move" operation. I never used this program and cannot say how trustworthy or good it is and only post it here based on the description.
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"They will be stored in a new folder in your bookmarks and can be restored all at once via the sidebar."
This might be it ! Thanks !
That is a default feature?
No you can only copy a tab to bookmark, not move it. It feels the same as "copy then close" when you only handle dozens of tabs, but I handle multiple hundreds and it just doesn't work great, often the saving tab stops midway without notice.
I need a real "move tab to bookmark" function that works seamlessly, is resilient and doesn't lose tabs.
Do you definitely need the tabs to be stored as bookmarks?
Take a look at Tab Session Manager. It lets you save as many tabs as you want as a session, which you can close and then reopen later.
I have it installed, but it's great for whole sessions. But I'm trying to actually roughly sort the tabs. The bookmark is very lacking, but I find
Tab Stash seems to be what you're looking for.
It looks good, but last time I tried it, it seemed to make heavy use of the tab hiding function, which really bothers me for some reason. They seem to have added a lot of stuff, I'll give it another try ! Thanks for the suggestion.