I could not log in with Microsoft Exchange, loaded an Firefox browser , could not log in. Opened a new account and it can't find my previous returns. Need 2018 return!

The web browser's most commonly used with TurboTax are Chrome, Internet Explorer, Firefox and Safari.

Close any TurboTax windows.  Clear cache and cookies on the web browser.  Close the web browser and thin re-open the browser.

To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

If still unsuccessful -

You have to sign onto your online account using the exact same User ID you used to create the online account.

Close all TurboTax windows on your web browser (including this one).  Copy and paste the account recovery website link onto a new web browser window and run the tool.

Use this TurboTax account recovery website to get a list of all the User ID's for an email address.  Run the tool against any email addresses you may have used - https://myturbotax.intuit.com/account-recovery

If none of the user ID's received will access your account, then use the option shown in blue on the account recovery website, "Try something else"

If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created.  TurboTax does not store online any returns completed using the desktop editions.