I have the latest version of safari (8.0.7) and websites still tell me to upgrade.

Please load CheckMyIp.org and post the "USER AGENT information" shown.

Select your avatar in the top left hand corner where sign out is displayed. Then double click on it to edit your profile.

If you go to Safari/About Safari do you see what is below?

1. From the Safari menu bar, select

Safari ▹ Preferences... ▹ Extensions

If there's an extension with the name "Fast Browser Search" or similar, remove it.

2. Back up all data before continuing.

Please triple-click anywhere in the line below on this page to select it:

defaults delete -app Safari CustomUserAgent

Copy the selected text to the Clipboard by pressing the key combination command-C.

Quit Safari if it's running.

Launch the built-in Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with Safari. If you use another browser, you may have to press the return key after pasting.

Wait for a new line ending in a dollar sign ($) to appear below what you entered. You can then quit Terminal. Test.