I do bookmarked lots of websites. Going back to maybe 10 years ago (when did firefox implement sync?). Some of them duplicated or cease to function. I also never open them again form bookmark.
With open tabs, at least I re-read them again, even if only to check if I still want to read them or to close them.
I’m an admin of a self hosted iRedMail (with iRedAdmin Pro).
My advice is: Don’t.
Getting an email server running is easy. Managing them is not.
There are some good advice here. Use commercial service with personal domain.