*** Solution for Safari ***
From your Safari menu bar click Safari > Preferences then select the Passwords tab.
Select the finance website then click Remove.
Now open Keychain Access located in HD > Applications > Utilities
Select Passwords on the left.
Type in the name of the website in the search field top right corner of that window. If there's a keychain available, right or control click the keychain then click Delete.
For Safari (macOS High Sierra):
1. When on website make a right-click the URL area and select option "Settings for This Website"
2. In appeared dialog box hover the cursor to "Auto-Play"
3. In menu choose preferable option: "Allow All Auto-Play", "Stop Media with Sound", "Never Auto-Play".