Firefox lets you specify more than one site as your home page by separating each address with a pipe character (|). This feature may lead to unexpected results when you try to set your home page to a site that contains a pipe character in the address. This article explains how to fix that.

• If Firefox repeatedly open new, empty tabs or windows after clicking on a link, see the Firefox keeps opening many tabs or windows article.
• If you get a tab named "Firefox Updated" or says "You've been updated to the latest version of Firefox." every time you start Firefox, please read the Firefox has just updated tab shows each time you start Firefox article.

To fix this problem, you will have to replace the pipes with their escape code.

1. At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click OptionsOn the menu bar, click on the Firefox menu and select Preferences...At the top of the Firefox window, click on the Edit menu and select PreferencesAt the top of the Firefox window, click on the Tools menu and select Options...On the menu bar, click on the Firefox menu and select Preferences...At the top of the Firefox window, click on the Edit menu and select Preferences...
2. Select the General panel.
3. In the Home Page text box, replace all pipes (|) with %7C
4. Click OK to close the Options windowClick Close to close the Preferences windowClose the Preferences window