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Mozilla Firefox to LastPass converter

Mozilla Firefox and LastPass both use CSV, but Mozilla Firefox writes 9 columns; LastPass expects 8 in a different order — so LastPass rejects a raw Firefox export or silently files everything into the wrong fields. Drop your export below and get back a file LastPass accepts.

Convert your Mozilla Firefox export

Drop your Mozilla Firefox CSV here or click to choose a file — nothing is uploaded

The conversion runs entirely in this tab using JavaScript. Your file is never sent to a server — you can confirm it by opening your browser's Network tab, or by turning off Wi-Fi before you drop the file in. Prefer not to do this in a browser tab at all? Download the converter and run it from your own disk.

Your export file is plaintext. Both the file Mozilla Firefox gives you and the one you download here contain every password in readable form. Delete them as soon as the import is verified, and empty your trash.

What's actually different between the two formats

Not one column name matches between the two formats ("url", "username", "password"… versus url, username, password…), which is why a direct import fails.

Mozilla Firefox column	LastPass column	What happens
`— none —`	`name`	Derived from the site's domain, since Firefox exports no title.
`username`	`username`	Same name, position adjusted
`password`	`password`	Same name, position adjusted
`url`	`url`	Same name, position adjusted
`— none —`	`totp`	Left empty — Firefox exports nothing for this.
`— none —`	`extra`	Left empty — Firefox exports nothing for this.
`— none —`	`grouping`	Left empty — Firefox exports nothing for this.
`— none —`	`fav`	Left empty — Firefox exports nothing for this.

What carries over

Field	Firefox	LastPass	Result
Item name / title	Yes	Yes	Carried over
Username and password	Yes	Yes	Carried over
Website URL	Yes	Yes	Carried over
Notes	No	Yes	Not in the source file
Folders / groups	No	Yes	Not in the source file
Two-factor (TOTP) secrets	No	Yes	Not in the source file
Favorites	No	Yes	Not in the source file
Custom fields	No	Yes	Not in the source file
Multiple URLs per entry	No	No	Not in the source file
File attachments	No	No	Not in the source file

Step 1 — Export from Mozilla Firefox

Open Firefox and go to about:logins.
Select the ••• menu at the top right of the Passwords panel.
Choose "Export Logins…" and confirm with your OS password.
Save logins.csv.

Watch out for

Firefox has no concept of a title, folder, note or TOTP secret. Entries are identified by URL alone, so an entry name has nowhere to go.
Firefox writes its header names in quotes ("url","username",…). Some importers choke on that; the converter normalizes it.

Step 2 — Convert it

Drop the file onto the converter above. It parses Mozilla Firefox's layout, maps each field onto the universal record, then writes LastPass's exact expected columns — including the empty ones its importer requires and, where the two differ, the right shape for 2FA secrets. You'll see a preview and a list of anything LastPass can't hold before you download.

Rather not put this file in a browser tab connected to the internet? The same converter is available as a single HTML file you can download and open with your network switched off.

Step 3 — Import into LastPass

Open your LastPass vault and choose Advanced Options → Import.
Select "Other" → "Generic CSV File".
Upload the converted file and confirm.

Watch out for

Secure notes come out in the same CSV as logins, with the note body in the "extra" column and url set to http://sn. Converters that ignore this turn every note into a broken login.
LastPass sometimes renders the export as an HTML page instead of downloading a file. Copy the raw text — do not save the page itself.

Step 4 — Verify and clean up

Open ten entries in LastPass at random and check them against Mozilla Firefox.
Sign in to one real site using LastPass to confirm autofill works.
Delete both CSV files and empty your trash. If your Downloads folder syncs to iCloud, OneDrive or Dropbox, confirm the deletion propagated there too.
Only then close your Mozilla Firefox account — and change any password you suspect was exposed while the plaintext file existed.

Questions

Why won't LastPass import my Mozilla Firefox file directly?

Not one column name matches between the two formats ("url", "username", "password"… versus url, username, password…), which is why a direct import fails. The converter rewrites the file into LastPass's exact expected layout, including the column order and any empty columns its importer requires.

Do my passwords get uploaded anywhere?

No. The conversion is JavaScript running in your own browser tab — the file is read with the FileReader API, transformed in memory, and handed back to you as a download. There is no upload, no server-side processing and no analytics attached to the file. You can verify this by disconnecting from the internet before you drop the file in: the conversion still works.

Does anything get lost moving from Mozilla Firefox to LastPass?

LastPass supports every field Mozilla Firefox exports, so a standard login entry survives intact — name, username, password, URL, notes, folder and 2FA secret. File attachments are the exception: no CSV export from any manager includes them, so download those separately before you close your Mozilla Firefox account.

Is the export file from Mozilla Firefox encrypted?

No. A Mozilla Firefox CSV export is plaintext — every password in it is readable by anything that can open the file, including other apps on your machine and anything that syncs your Downloads folder to the cloud. Convert it, import it, then delete both files and empty your trash. If your Downloads folder syncs to iCloud, OneDrive or Dropbox, check that the deletion propagated.

Anything unusual about Mozilla Firefox's export?

Firefox has no concept of a title, folder, note or TOTP secret. Entries are identified by URL alone, so an entry name has nowhere to go.

Anything unusual about importing into LastPass?

Secure notes come out in the same CSV as logins, with the note body in the "extra" column and url set to http://sn. Converters that ignore this turn every note into a broken login.

Related converters

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