With the new identity block landed the arrow of the identity panel appears a bit on the left of the generic icon. It should be directly under the icon.
Created attachment 617517 [details] [diff] [review] patch for Windows and Linux
The doorhanger also needs to be shifted upwards by a few pixels for security reasons. Otherwise a webpage can show a similar image which the user may confuse with the doorhanger. This is more visible in small icon mode. The doorhanger should be attached to the lock/globe icon (like in Google Chrome).
With the conditional button not visible (default state) and the https padlock the arrow is still 1 px too on the left.