In order to send a tab to another synced device from your Firefox for IOS please try the following steps:
- Tap on the icon to the left of the star, it will be titled “Activities”
- Make sure that Firefox is listed
- Tap on “More...” and tap on the switch next to “Send Tab”
- Next find the tab in History > Tabs from other devices or about:sync-tabs
or if you want to look at it later:
- Tap on it and choose to either “Add to Reading List” or “Add to Bookmarks”
Now you are all set to continue browsing on all other installations of Firefox on your other devices!