How to Enable 3rd Party Cookies

Google Chrome (Windows & OS X)

1. 
   Under Menu or , select Settings
2. Scroll down to show advanced settings
3. Under the Privacy section, click on Content settings
4. Select Allow sites to save and read cookie data (recommended)
5. Unselect Block third-party cookies
6. Close the tab

Official instructions from Google.

Mozilla Firefox (Windows)

1. Under Menu or , select Options 
2. Select the Privacy panel
3. Set Firefox will: to Use custom settings for history
4. Check Accept cookies from sites
5. Set Accept third-party cookies to Always
6. Set Keep until to they expire
7. Click on OK
   
   

Mozilla Firefox (OS X)

1. Under the left top Firefox button in the task bar, select Preferences
2. Select the Privacy panel
3. Set Firefox will: to Use custom settings for history
4. Check Accept cookies from sites
5. Set Accept third-party cookies to Always
6. Set Keep until to they expire
7. Click on OK

Official instructions from Mozilla.

Internet Explorer (Windows)

1. Under Tools or  , select Internet Options
2. Select the Privacy tab
3. Under Settings, drag the scroll to the bottom to Accept All Cookies
4. Click on OK

Official instructions from Microsoft.

Safari (OS X)

1. Under the left top Safari button in the task bar, select Preferences
2. Select the Privacy panel
3. Set Block cookies and other website data to Never
4. Close the window

Official instructions from Apple.

Opera

1. Click on Menu in the top left corner and select Settings.
2. Click Browser section on left side panel.
3. Go to Network section and click on Change proxy settings.
4. Click on Privacy tab at the top. In settings move the bar to Medium
5. If you have XP Service Pack 2, the section below Settings will say Pop-up Blocker 
6. Select the Pop-up Blocker checkbox and click the Settings button
7. Add linkshare.com and linksynergy.com to the Address of WebSite to Allow box
8. Close the pop-up blocker window.
9. Click on the Security tab
10. Click on the Trusted Sites button
11. Click on Sites
12. Add linkshare.com and linksynergy.com in the box
13. Click Close
14. Click OK

Official instructions from Opera.