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Firefox can import bookmarks and history by itself, as well as form-fills and some other stuff, from Menu -> Settings -> General -> Import Data. Unfortunately the recommended way to import tabs is to bookmark them as a group, then import the bookmarks...

@quixoticgeek There's Floccus for cross-browser bookmarks sync (and tabs, not sure about cross-browser). Works off of cloud storage, and you have to set it up on both ends and maintain a bit of common structure in your bookmarks. I de-Mozilla'd my desktop Librewolves and phone *foxes a bit using that, and still use it

Librewolf has Settings > General > Import Browser Data. For some reason, right now it's only showing me browser history as an option for the Chromium profile I have here.

@quixoticgeek I found this browsing as your question was interesting, so no experience or guarantees!
https://www.ghacks.net/2019/09/27/how-to-import-tabs-from-chrome-to-firefox-and-vice-versa/

@quixoticgeek I love how "tabs" are now considered valuable state needing migration. 😂