I don't think BugMissoo6 understood your question. Multiple instances of Maxthon in task manager is perfectly normal as it is designed to keep the whole browser from crashing when just one item or page crashes. Version number doesn't matter as this has been this way since MX3, I believe. This is not a problem at all.
Yes, most modern browsers use multiple processes especially those using chromium base, I'd be surprised if palemoon doesn't also. FF I don't know. It's nothing to worry about, it's by design.
You never sync it to the cloud?...
ok, I misunderstood you.
If they are only in local, have you try clearing the cache?
what do you mean by "z" backup? sorry sometimes some abbr. are a little bit confusing for me.
so big...Is there anything wrong for the sync in your account? Have these favourites been synced in your Maxthon account, or only saved in your local device?