Make sure you aren't blocking javascript

https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

Thanks for the response, But - NOT a security/windows infection issue. Javascript is enabled. I have two different machines now that I've updated both with same problem - many links won't work - clicking on them doesn't work but if I choose open url in new tab they do. The links work in all other browsers on all machines EXCEPT Firefox - AND even when I start Firefox in Safemode/no extenstions.

Please do the following so we can get environment variables and other data:

1. Use ONE of these methods to open the Firefox Troubleshooting Information page:
   • Click the menu button , click on help and select Troubleshooting Information.
   • Type about:support into the Firefox address bar and press the enter key.
2. At the top of the Troubleshooting Information page that comes up, you should see a button that says "Copy text to clipboard". Click it.
3. Now, go back to your forum post, right-click in the reply box and select Paste from the context menu (or else click inside the reply box and press the Ctrl+V keys) to paste all the information you copied into the forum post.

If you need further information about the Troubleshooting information page, please read the article Use the Troubleshooting Information page to help fix Firefox issues.

Thanks in advance for your help!

Does a middle-click on the link work to open the link in a new tab if you currently are left-clicking?

You can check this pref on the about:config page.

• http://kb.mozillazine.org/browser.link.open_newwindow
• 1: current tab; 2:new window; 3:new tab;

For links opened via JavaScript you can look at this pref:

• http://kb.mozillazine.org/browser.link.open_newwindow.restriction

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/