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In the Joomla! 1.6/7/2.5 series the page title that is used by browsers to label windows and tabs is controlled by the a series of default behaviours. The page title is controlled by a global setting, the menu item that points to the page and finally the default behaviour is used.
The first starts in Joomla!'s Global Configuration, navigate to Global Configuration ► Site ► SEO Settings


Global Configuration's Site Tab has an "SEO Settings" panel. If you want every page to have the Site Name prefixed to the Page Title you will need to set the "Include Site Name in Page Titles" to "Yes".
In each menu item the Page Title is calculated from the menu items name by default unless the menu item points to an Article in which case the Page Title will be the name of the Article. So, if the menu is called "Products" and points to a Category Blog page for content in a category then the Page Title will be "Products".
If the menu item is called "About" and points to an Article called "About Us..." then the page title will be "About Us...".
There is one final option that can affect the page title - each Menu item can set the Page Title. As shown in the image below, in the menu items Page Display Options you can specifiy a "Browser Page Title".

As you'll notice the Tooltip advises you on what will happen if you leave it blank (by default this option is almost always blank).
The "Frontpage" menu item is the one situation in which the "Browser Page Title" may not be blank.
A typical Joomla! installation recommends that you install the sample data so that you can get a feel for how content is structured in Joomla!. Of course when you've finished with the sample content you normally delete it, however as people are unsure of menus they tend to re-use the "Home" menu item, which in the sample data has it's Browser Page Title set to "Welcome to the Frontpage".
Given the number of Joomla! websites that all have "Welcome to the Frontpage" as the page title of their homepage it appears to be a widespread phenomena.
You can identify the menu item that is responsible for the frontpage of your Joomla! website by the orange star displayed next to it in the Menu Manager. You can see an example in the image shown below.
Craig Phillips Pty Ltd
Chapel Hill, QLD, Australia
Brisbane Tel: +61-7-3056-1992
Sydney Tel: +61-2-8090-5408
abn: 42 097 843 500
We like to work with our clients and our staff on a personal basis. If we can't meet you it makes it hard for us to judge the project you want us to undertake.
We take the same approach to people in our team, we do our breifings in person, so we're clear on the directions each team member is taking with every project. When it comes right down to it — it really is who you know!