As discussed at the Mozilla Summit: when performing Bug triage or other tasks, the context provided by the page title being listed in title bar is very useful. For example, as more tabs are open and a user is working with BMO, the bug's number is not fully printed in the tab bar and the title of the bug is not even visible. It is awkward to scroll from the top of the page and again to the bottom to remind the user of what page he is on. Since that space is not currently used for anything other than the combined menu, there is no loss in continuing to use some of that screen real estate for the page title again.
If users will put buttons there, then what? if users will put there tabs, then what?
How about a customizable (removable/relocatable) page title widget? [See Bug 575487;contain some form of discussion there] It is hard for page title and tabs to co-exist in title bar. Reason being the height of the title bar is very short. Putting the page title when tabs are in title bar makes the page title very small and almost unreadable. One Possible solution is to make use of the Firefox Button. As it has the height of the title bar, and it is easy to see and easy to identify(due to its obvious colour). The possible solution is to put the summarized page title into the Firefox Button and lengthen it to fit the page title. Summarized Page Title mean that it should only contain the information that is important. Examples: Normal Page title Bug 578611 - The new title bar should continue to draw the page title Blogger: Your blog Name - Manage Posts Earth - Supreme Commander Wiki - Guides, units, fractions, and more Summarized Page title Bug 578611 Blogger - Manage Posts Earth - Supreme Commander Wiki
I think that is the solution; ideally, there would be three options: full title, trimmed title, and no title.