Opera

Fitts Law
fix: "open opera:config & search for Chrome & set Chrome Integration Drag Area Maximized to 0 for it to work." 

why is this not the default??

See Fitt's Law

References:
 * Tamil - Reduce integration drag area in non-maximized Opera window - http://my.opera.com/Tamil/blog/reduce-integration-drag-area-in-non-maximized-opera-window
 * Putting Opera tab manager on the most top? - Super User - http://superuser.com/questions/509354/putting-opera-tab-manager-on-the-most-top

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Newer versions: about:config

Select "Show Advanced Settings" and search for: "User Interface - Disable tab bar's top spacing when browser window is maximized"

References:
 * Putting Opera tab manager on the most top? (Chromium engine-based Opera) - Super User - http://superuser.com/questions/657998/putting-opera-tab-manager-on-the-most-top-chromium-engine-based-opera

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Type opera:config in Opera's addressbar and press Enter. It'll open Opera Preferences Editor page. opera:config

With the release of new versions, opera:config page has been replaced by opera://flags opera://flags

There are many more similar secret pages in Opera. Just type opera: in Opera's addressbar and a drop-down list will automatically appear showing all secret pages such as opera:cache, opera:debug, etc.

How to Access Hidden Secret “Advanced Configuration” Pages in Mozilla Firefox, Google Chrome and Opera Web Browsers? - AskVG - http://www.askvg.com/how-to-access-hidden-secret-advanced-configuration-pages-in-mozilla-firefox-google-chrome-and-opera-web-browsers/