Easiest to set multiple homepages is to open only these pages in normal tabs (pinned tabs are excluded from homepages). Then you can use "Use Current Pages" (Page become plural Pages when more than one tab is open) on the "Settings -> Home" page to set those pages as multiple homepages. You can also do this manually and separate the homepages with a pipe symbol (|), so URLs with an pipe need to encode the '|' as %7c. *https://support.mozilla.org/en-US/kb/how-to-set-the-home-page