Like “Chrome Sync”, “Firefox Sync” can synchronize the following content for you:

1. Add-ons;

2. Bookmarks;

3. Passwords;

4. Preferences;

5. History;

6. Tabs.

But a big difference is: “Firefox Sync” will encrypt your data before pushing it to the Mozilla server with your personal key(generated by the Firefox browser automatically), that means even Mazilla can not read your data. But for “Chrome Sync”, you data is not encrypted, that means Google can read your data. So if you want to protect your privacy, “Firefox Sync” is better.