Is it possible to read the accessibilityLabel attribute of an item using AppleScript?
You can access the 'description' of the 'UI Element' of each row. Like so:

tell application "Safari" to activate
tell application "System Events" to tell process "Safari"
    keystroke "," using command down -- display preferences
    delay 1
    click button "Privacy" of toolbar 1 of window 1
    delay 2 -- let the cookie count update
    click button "Details…" of group 1 of group 1 of window "Privacy"
    set z to description of UI element 1 of every row of table 1 of scroll area 1 of sheet 1 of window "Privacy"
end tell
return z