ThemeBeta - ThemeBeta is basically a theme creator for the Google Chrome but is also the provider of a significant numbers of apps, games and themes for Google Chrome as well.
Chrome Extension Downloader - Chrome Extension Downloader is the name of a website dedicated for downloading and Chrome extensions.
Chrome Web Store - Chrome Web Store is an officially recognized application store being developed and managed by the Google.
ChromeExtensions.org - ChromeExtensions.
Userstyles.org - Userstyles.
Mozilla Add-ons - Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.