Currently 1Password 3.8.22 for Mac trying to upgrade to 5.0.2

I am running Yosemite 10.10 on a MacBook Pro mid 2009. I regularly use Safari 8.0, Firefox 33.1, and Chrome 39.0.2171.52 beta (64-bit). I sync using Dropbox 2.10.41. Safari lost it's extension well before I upgraded to Yosemite but both Firefox and Chrome have worked well except they stopped syncing a few days after updating to Yosemite. I downloaded 5.0.2 but before installing went through this procedure:

If you are upgrading to the newest version of 1Password straight from 1Password 3, be sure to remove the old version (3.x) of the browser extension. (There is no need to do this if you are upgrading from 1Password 4.)

Caution: Before uninstalling the 3.x extension from your web browser, make sure all your 1Password items have been synced back to the main app; otherwise, you could lose some or all of those items! The sync process is automatic, so there’s no button to click or progress bar to observe. Instead, please follow the instructions in this section.

To make sure 1Password has all your data:
Launch 1Password 3.
Important: You can’t use 1Password 4 with the 3.x extensions.
In 1Password 3, press ⌘Q to quit the app.
In your web browser, manually save a new login.
The web site doesn’t matter—any login page will do. The username and password don’t have to be real, either, since you’re not actually submitting the login form. Give the login a recognisable name, something like “1Password 3 is up to date!”
In 1Password 3, verify that the Login you just saved in your web browser is there in the main app.
Quit 1Password 3, and uninstall the 3.x browser extension by following the appropriate set of instructions below.

After completing the procedure 1Password 3 did not have the new changes I made so I haven't deleted the extensions nor tried to update to 5.0.2. Also for quite some time even before I upgraded to Yosemite, in Firefox I have 2 extension emblems. 1 is a "1P" and the other is a key. They both show they are version 3.9.20.