Right now I’m moving my stuff from Floorp over to Librewolf and noticed that some of my bookmarks are ones that were auto-created by Manjaro.
Manjaro was the first Linux distro I used as a daily driver (after Windows Update ate my boot partition) around the spring of 2022. I know that four years is not a long time, but within context, I’ve wiped and reinstalled my PC at least six times (soon to be seven) and moved from Firefox to Brave to Floorp to Librewolf, and those bookmarks survived everything.


Not the person you asked, but at some point I stopped using bookmarks and just started leaving 900 tabs open. I had no rational reason for this transition.
What happens if you close your browser and everything is wiped or switch machines?
Restore previous session, and I’ve used the same machine for 12 years. If I really wanted to migrate to a different computer I could save all open tabs as bookmarks. There’s been a few cases where I lost all the tabs, and I reopened those I remembered and figured the rest failed the rapid unscheduled tab cleanup.
Same! Check out tab groups. It’s a game changer, if you want to organize all those open tabs a bit.