You may find it useful to manage the use of Adobe Flash within Safari.
Open Safari Preferences

Click the Security tab

Click Plug-in Settings

Flash Plugin

Click the Adobe Flash Player in the left column.
Flash Activation

For each website that you’ve visited, that uses Flash, there’s an entry in this table. Each can be assigned one of three options.
- Ask
- Off
- On
There is also a setting for allowing other websites to access Flash.
Click Done when satisfied.
Note: You can set a default for websites not listed.