Recently (and I'm not sure if this happened in with an update to Firefox or to 1Password), I've been unable to get the "fill username / fill password" buttons to appear in Firefox.
I select, e.g., a username field, long-press the lock icon on the 1password keyboard, manually browse to the correct login, but then when I'm returned to Firefox, the fill buttons aren't displayed. This is true regardless of whether "automatic filling" is enabled, and is a regression that appeared sometime in the last couple of months.
Other apps (including Chrome) work as expected. I've been working around it by copying the password to the clipboard, but obviously that's not ideal.
1Password Version: Android 6.5BETA-7
Extension Version: Not Provided
OS Version: Android N 7.1.1 (Pixel)
Sync Type: Not Provided