Mozilla Firefox

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Get flash to fully experience Pearltrees
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html

Flash Settings Manager

Note: The Settings Manager that you see above is not an image; it is the actual Settings Manager. Click the tabs to see different panels, and click the options in the panels to change your Adobe Flash Player settings. The list of websites above is stored on your computer only, so that you can view or change your local storage settings. Adobe has no access to this list, or to any of the information that the websites may have stored on your computer.
Stay In Sync Sync seamlessly connects your desktop and mobile Firefoxes, so you can access your browsing history, passwords, bookmarks and even open tabs no matter which device you use. Now you can surf the Web on your desktop, get up in the middle of browsing and have your open tabs ready and waiting on your mobile, just as you left them. Your browsing will never be the same!

Customize Your Browser

http://www.mozilla.org/en-US/firefox/customize/
Get More Out of Personas Personas Plus gives you one-click access to the full Personas experience. It's free and fun to use. Here are some of the cool things you can do with Personas Plus:

Personas

http://www.getpersonas.com/en-US/