Chrome Shāngdiàn lǐ yǒu chéngqiānshàngwàn de kuòzhǎn chéngxù.
There are tens of thousands of extensions in the Chrome Web Store.
Tips
usage
Standard tech term, especially for Chrome extensions where Chinese localization renders 'Extensions' as 扩展程序. Synonyms: 插件 (more general 'plug-in'), 附加组件 (Mozilla's 'add-on'). For browser-add-on context, 扩展程序 is the safest choice.