What is X mark and how do I get rid of it

It comes up every time I start Internet access

Xmarks Sync is an extension to store data on a web server so you can access it via other devices.
*Xmarks Sync: https://addons.mozilla.org/firefox/addon/xmarks-sync/
It is similar to Firefox Sync.
You can uninstall the extension if you do not want to use it.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/Uninstalling+add-ons

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