answer:Unless you have an extension that can do it, you’ll have to alter (or possibly create) the userChrome.css file. Where this file is depends on what kind of system you are using. If you have an Apple, it should be in: Hard Drive\Users\[Username]\Library\Application Support\Firefox\Profiles\[random alphanumeric name].default\chrome If you are using Windows, it should be in: C:\Documents and Settings\[Username]\Application Data\Mozilla\Firefox\Profiles\[random alphanumeric name].default\chrome Note that [random alphanumeric name] just means that the default folder will be called something like smp6filam.default. Similarly, [Username] just means that this is where the name of your profile (“Administrator,” “Jim’s Computer,” etc.) will be. If you have the file, open it up and add the following code: #content > tabbox { -moz-box-direction: reverse; } If you don’t have the file, create a new text file and then add the same code as above. The next time you restart Firefox, your tabs should be at the bottom.