Do you support Firefox 4?

In short, YES!

The slightly longer answer: 1Password’s Firefox 4 extension is a recent development, so please make sure you’re running the latest version of 1Password 3 by going to 1Password > Check for Updates within the main 1Password application.

In most cases the Firefox 4 extension should just work, but if it doesn’t you may need to enable this by first quitting Firefox and then opening 1Password and going to 1Password > Preferences > Browsers and checking the option for Firefox 4. Once you’ve done this, please restart Firefox 4 and you should find the 1Password extension is up and running.

1Password 3 and Firefox 4

If you experience any problems after installing the Firefox 4 extension, and you don’t use Firefox 3 anymore, please uncheck the option for Firefox 3 in the same 1Password > Preferences > Browsers window.