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I am confused and not tech-savvy and inadvertendly lost my previous tabs and history, but cannot restore previous session, help please!
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The options for tabs and history are under
Settings > Tabs and browsing
and
Settings > Privacy and security for History
Important: Do not close Firefox — or, if you've already closed it, do NOT reopen it before reading the following:
This is a few years old guide, but still applies today.