I have downloaded and installed the "NewTabURL" for Firefox and I have selected http://www.google.com/ as default URL. The problem is that, each time I open a new tab, a blank page is opened. What can be done?
Remove the add-on and proceed as below:
In the search bar of your browser type: "about:config" and press Enter
Click on "I would be careful, I promise"
Then in the list that appears, look for the following entry.
Double-click on the entry
In the small window that opens, type the URL of your page and validate using the OK button.