Safari tabs/bookmarks

Hello,

How I can sync bookmarks/tabs between Safari and Firefox or Chrome ? I am trying to get rid of firefox/chrome on mac but I have to use it somewhere else and I need to sync bookmarks and tabs if possible.

If I open a lot of tabs some are hidden I have to click ">>" on the right top corner to view the rest of them. The same number of tabs are visible on chrome/firefox. Can I change that?

Sometimes the restore tab function doesn't work due to crash or whatever. No problem with firefox/chrome where I can always restore the tabs.

Thanks