From CNET News.com: Firefox users who've installed a custom theme may bump into trouble if they upgrade to the latest version of the browser.
Released earlier this week, Firefox 14 offers a few enhancements, including better security. But it comes with one gotcha -- lack of support for a lot of existing themes.
Many Firefox users probably know that they can change the style of their browser by installing one of many custom themes, available at the Themes section on Mozilla's Add-Ons page. You can choose from among hundreds of different themes to customize the look and feel of Firefox's menus, toolbars, and overall background.
I used a theme called MacOS X, which offered a simple but sleek look to the browser based on the style of Apple's OS X. But when I installed Firefox 14, I received an alert that the theme would not be compatible with the new version. I moved ahead with the install anyway, and afterwards Firefox reverted back to its default theme.
In search of a new theme, I scoured the Themes section only to discover a huge number unavailable for and incompatible with my new version of Firefox. The thumbnails for each theme tell you right up front whether it will work with FF 14, so at least you don't need to waste time clicking on every one. But finding a theme that you like and works with the new version can still present a challenge.
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