Once I enter responsive design mode, the 1P extension will no longer fill in fields.
1Password Version: 6.8.4
Extension Version: 22.214.171.124
OS Version: macOS 10.13.1
Sync Type: Not Provided
Referrer: forum-search:firefox responsive design mode
There does seem to be a bug. It isn't clear precisely where or why yet so we'll need to investigate. Thank you for bringing this to our attention.