If you've got too many tabs it may be time to start thinking about using a different organization scheme.
Unlike some of the other suggestions, I don't think dropdown menus are the answer, especially on the web. Some of the major drawbacks include:
- They hide information; Can you tell me which menu in Word inserts a footnote without hunting?
- They've fallen out of favour as they're difficult to represent in mobile displays where there's less room and no hover state.
- They need fallbacks in case the submenu can't be displayed for some reason, leading to confusing behaviour where clicking the top level item acts more like a tradition navbar.
Generally, most sites I've seen that have so many navigation items that they can't fit them all into their navbar are being overzealous with their organization. Simply grouping related content into a single page with headings, instead of separate pages, can make the number of pages far more manageable.
Not only that, but users aren't afraid to scroll. They're already on the page so they'll happily wheel or swipe their way down the page at their leisure. Buttons, on the other hand, are subconsciously seen as decisions and users are wary of decisions, especially when presented with a lot of them at once. Each click represents the possibility that they'll be taken away from where they are to somewhere unfamiliar and not be able to get back (browser metaphors aside).
Even if they can overcome their analysis paralysis with so many tabs, do you really think they'll be happy reading to the bottom of one (relatively) short page, only to have to scroll back to the top to get to the next page? Sure, you can try using the "scroll to top" button approach, but again, that's a click that users may interpret as an unknown navigation.
My recommendation would be to reorganize the content within the tabs, rather than trying to build a better mousetrap. Sometimes the best user experiences have nothing to do with user interfaces.