You can install Opera themes for Firefox to make the Firefox web browser look more like the classic Opera web browser after installation.
Version 3.6 of the Firefox web browser introduces several new design options for theme creators that are not available in previous versions of the Internet browser, including the latest official release version Firefox 3.5.4.
One of the first themes to make use of these new features is the Operetta theme which is available as an experimental theme from the official Mozilla Firefox website.
The Operetta theme comes in two versions: a normal and advanced version. These differ mainly in the toolbar layout. Both Operetta themes are based on the design of the Opera 10 web browser with the normal version making use of the standard toolbar layout with tabs below the other toolbars, and the advanced version placing the tabbar above all other toolbars.
Both editions of the Firefox theme look professionally done and the selection comes down to the personal preference of the user.
Some Firefox design mockups suggest that the developer's are thinking about moving the tabbar to the top of the web browser header and the Operatta Advanced theme for Firefox can be used to get accustomed to this possibility.
It might also be the prime choice for Opera or Google Chrome users as these web browsers place the tabbar by default above most - in Google Chrome's case all - other toolbars. The Operetta and Operetta Advanced themes are available at the Mozilla Firefox website.
Update: The theme is no longer available on the official Firefox themes website. An alternative is the Fopera theme. Here is a screenshot of the theme's header when installed in the Firefox web browser.
Update 2: You can install Opera themes for Firefox to make the Firefox web browser look more like the classic Opera web browser after installation.: The theme has not been updated since 2011, which may be an indication that it is no longer actively maintained by its author. It is unfortunately the only remaining Opera theme for the Firefox Internet browser.
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