Firefox lets you specify more than one site as your home page; each page will open in its own tab when you start Firefox. To specify multiple pages, you separate each address with a pipe character (|) when you set the home page.
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. When you start Firefox, you may get one tab that's correct (or at least, the wrong page on the right site) and one additional one that goes to another site.
To fix this problem, you will have to replace the pipes with their escape code.
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