I tried to install Firefox but it says that I need another device. I don't have another device. What should I do? Thanks. Vivienne
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If you are talking about sync, sync is an option. Shut down sync from here.
Type about:accounts<enter> in the address box.
[v57+] Type https://accounts.firefox.com/settings<enter> in the address box.
Using Sync is optional. You can close the tab once you have created the Sync account if you do not want or can't add a mobile device. Note that Sync isn't meant to be used as a backup and with only one device usefulness is limited.