1Password 126.96.36.1996, just saw this for the first time.
Normally, when I click on a URL in the 1Password window it just launches a new tab in Firefox with exactly the URL from 1Password.
When the URL is https://minecraft.net/ (with or without the trailing slash) it appends
?onepasswdfill=HEXCHARACTERS... causing the site to respond with (in this case) a 403 error.
I have auto-submit turned off, and cannot find any preference related to this. Also, I DO NOT have the Firefox extension installed. I don't want 1Password to enter any information for me, I want to retain complete control of all data transfer between 1Password and my browser.
1Password Version: 188.8.131.526
Extension Version: N/A
OS Version: Win7x64 Pro
Sync Type: Dropbox