Legacy versions of 1Password and extensions
Starting in 1Password 3.6, the minimum OS required is Mac OS X 10.6 Snow Leopard.
If you are on 10.4 Tiger or 10.5 Leopard, you can download one of the versions below. While we are happy to help if you have problems using these other releases, new features will not be added so it is recommended you upgrade to a newer version of OS X to run the current version of 1Password as soon as possible.
Download: 1Password 3 for Mac OS X Leopard (10.5)
1Password 3.6 added support for OS X 10.7 (Lion), replacing OS X 10.5 (Leopard) support. The last supported version for Leopard is 1Password 3.5.
Firefox 3, 4, 5, and 6
It's really a good idea to upgrade to the latest Firefox version if at all possible. But if you really need to stay on a previous version of Firefox, you can download the old 1Password extensions here:
Once downloaded, show the file in Finder and then drag and drop it onto an open Firefox window.
Google Chrome extension for Leopard, Chromium, Chrome Canary, and RockMelt
The last version of the 1Password extension to support Google Chrome, Chromium, Canary, and RockMelt on Leopard was version 3.6.3. You can download this version of the Chrome extension from here:
Important Installation Note: Chrome will prevent installation if a newer version is already installed. Be sure to go to the Window > Extensions screen and uninstall your existing version of 1Password. Then restart Chrome; this is important to avoid a Chrome bug where it incorrectly reports the file as invalid. After restarting Chrome, click the link above to start the install process.
Automatic Update Note: The automatic updater in this version has been disabled temporarily until the new Chrome extension is able to support the Chromium, Canary, and RockMelt Chrome variants. Once support is added you will be automatically updated, except on Leopard.
Download: Camino 2, Flock and Older Browsers
1Password 3.5 was the last version to support Camino 2 and Flock.
Download: 1Password 2 for Mac OS X Tiger (10.4)
1Password 2.12.1 was the last version to support Tiger.
Note that 1Password 2 is free for 1Password 3 owners. In other words, 1Password 3 licenses will work in 1Password 2.