"Safari" would like to control this computer using accessibility features I recently did a clean install of OS X Yosemite 10.10.2 on my MacBook Air.
I was making a credit card payment on the Barclaycard website and received a dialog window saying &quot;&quot;Safari&quot; would like to control this computer using accessibility features.&quot;
I chose &quot;Deny&quot; but I am wondering why I received this dialog in the first place? I am certain I was on the actual, official Barclaycard website. Do I have malware? The only extensions I am using with Safari are AdBlock and 1Password.

Text only version:

&quot;Safari&quot; would like to control this computer using accessibility features.
Grant access to this application in Security &amp; Privacy preferences, located in System Preferences.
Open System Preferences Deny
Based on the way accessibility features work in macOS, it is reasonable to assume that when saving or entering usernames and password using Apple's Keychain, or when using AutoFill to enter data into a page, that it uses some type of virtual keyboard that allows the system to enter text in user land. This would be very similar to how assistive devices function when using an Automator extension such as the "Watch Me Do" function. The reason why this comes up is because it is attempting to either read or write to the screen on behalf of the user. 

This is an assumption, but it is based on working technical experience with the underlying software sets involved.