Hi bennycurry Please make sure that you have set up sync: How do I set up Sync on my computer? to see bookmarks across both devices.

Or if they are missing completely and there is no menu, please reinstall Firefox for Android.

I did all that many times and it didn't help.

Is there a limit to how many android devices one can have with the same Firefox account?

Bennycurry, I do not think so, but I have not tried to attach more than 10 devices. I am guessing that the size of merged data will just increase on the sync account.

However, back to the original question, are you using Firefox Sync? If so, if one of the devices unchecks bookmarks, all bookmarks will not sync. If not, please make sure all of the devices are on the new sync and that there are no warnings on the Tablet's sync status page. [accounts.firefox.com] is the url for login.

I've checked and unchecked all items and re-Synced but to no avail. History syncs, but bookmarks, passwords, and tabs do not. This only occurs on my NEXUS 10. On my NEXUS 7 all items are Synced. Could it be a problem with NEXUS 10. 10 and 7 both have Android 4.4.

Could it be a problem caused by an old version of Firefox Sync hanging around? I notice that on my NEXUS 10 after I delete the Firefox APP and all data then re download the Firefox APP when I go to add a new account the old Firefox (deprecated) account is listed as a choice. So I add my synced account by logging into Firefox. I find no way to delete the old Firefox (deprecated) account from the suggested choice list, and it's not listed as an active Firefox account.

Yes, you found it. So it sounds like the old account is still there and the device is not on the new one yet.

Way around this: On that device visit https://accounts.firefox.com/settings and log into the new account there. Use this only if you need a reference: Sync your Firefox bookmarks, history, passwords and more

Thanks for all your suggestions and help. Made a backup before I deleted my Firefox Account, created a new one, reinstalled Firefox on my Nexus 10 and bookmarks still are not synced. All sync works well on my Nexus 7, and my two computers.

I'm taking a break on trying to fix the NEXUS 10 problem and will come back to it sometime in October.