SynthPass Firefox

SynthPass

By: F. Ruiz
High-security password synthesizer. You only have to remember your Master Password, which you never need to change. There is no encrypted vault that may be compromised because passwords are generated on the fly. You can also store user-generated ones

Features & Capabilities

SynthPass is a different kind of password manager: it is a password synthesizer.

With SynthPass, there is no "vault" that has to be protected from hackers because your passwords are synthesized on the fly, just as you need them. SynthPass-made passwords are always high strength and comprise letters, numbers, and special characters. Passwords for different websites are guaranteed to be totally different.

You never have to change your Master Password. When a website forces you to change its password, simply change the optional serial that is used to synthesize that password. SynthPass will remember the serial, as well as your user ID. Your Master Password will never be stored, and it disappears from memory after five minutes not using it.

And, if you absolutely must use a certain password, SynthPass can use that too! It is encrypted for storage and synced with the browser's own files so no third parties need to be involved.

Unlike conventional password managers, SynthPass

  • won't pop up and interrupt your flow; it is activated only when you click its icon on the browser toolbar
  • won't store anything secret, only user IDs and optional serials, if you allow it
  • is always available, because it does not have to connect to "the Cloud"
  • makes only strong passwords
  • won't ask you for money
  • won't show ads

SynthPass is based on the WiseHash key-stretching algorithm, which evaluates the information entropy of your Master Password and subjects it to a variable number of rounds of SCRYPT key-stretching. The weaker the password, the more stretching. This forces would-be hackers to spend an inordinate amount of computer time testing weak passwords before they can get to yours. SynthPass displays an accurate measurement of your Master Password's entropy to help you come up with a strong one. This is the same algorithm stretching the user password in PassLok Privacy and PassLok for Email, also in this web store.

When there is no password to be filled, SynthPass displays a box where you can store securely encrypted notes for that particular website. Good place for extra login instructions, your first pet's name, or whatnot. Like everything else, the notes sync with the browser without a need for extra servers.

There's also a button for moving the current page into an isolation cage similar to Private Browsing, but within the same set of tabs as the regular pages. This is also accessible via the right-click menu.

This is a browser extension, and therefore is poorly supported on mobile devices. There is, however, a web app that includes the same password-making engine and runs well on mobile devices. It can be found at:

https://synthpass.com/app

User Growth & Download Statistics

Manifest V3 Add-on
By:
F. Ruiz
Daily users:
-
Rating:
4.00
(1)
Version:
0.2.9 Last updated: 2023-03-23
Version code:
5543628
Creation date:
2018-09-15
Risk:
Low risk impact Low risk likelihood
Permissions:
Size:
100.02KB
Email:
fr*****@gmail.com
URLs:
Website
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-06-18
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.
Developed by:
F. Ruiz
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/synthpass/
Email:
fr*****@gmail.com
Website:
https://github.com/fruiz500/synthpass

Permission Change History

2023-03-23: Version 0.2.5 → 0.2.9
Add Permissions: scripting alarms
Remove Permissions: webRequest webRequestBlocking

Is SynthPass Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

SynthPass requires very minimum permissions.

Risk impact analysis details
  • High Allows retrieval of a user’s browsing history, presenting a notable privacy risk.
  • Low ****** ***** ** ******* ****** ********** **** ** ** ******** ******* ** **** ***** *************
Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

SynthPass has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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