This post only lists browser extensions and script entry points.
For commonly used software, check Useful Free Software Toolbox.
For related articles on this site, see Site Article Index.
What Are Extensions?
Browser extension entry point
Just click the puzzle piece icon on the right to go to the extension store to download. In short, browser extensions are extra scripts that get injected into web pages, which means they can do all sorts of things. Because of that, you should avoid downloading unknown extensions and stick to official or reputable ones from the store—they’re usually good enough.
AdGuard
AdGuard Extension Panel
Available in the official extension stores, AdGuard is an extremely handy ad-blocking extension—definitely a must-have for browsers. Just download it and keep it running.
Tampermonkey
The famous Tampermonkey script manager probably needs no introduction—it’s basically a custom extension for other extensions. Visit https://www.youxiaohou.com/ for all kinds of scripts and resources. Here’s a script I use a lot: hmjz100/LinkSwift: A JavaScript-based tool for obtaining direct download links from popular Chinese cloud drive services, modified from Netdisk Direct Link Helper. Supports Baidu Netdisk, Aliyun Drive, China Mobile Cloud, Tianyi Cloud, Xunlei Cloud, Quark Cloud and more.. There are plenty of other useful scripts too, and if you’re a student, Tampermonkey can help with a lot of things (I’ll keep the details to myself, haha).
Immersive Translate —陪读蛙 (Peiduwa) 
Peiduwa Extension
Find it in the extension store—it’s great for bilingual translation and the free version is already very good. If you want more features, you can top up Deepseek credits and use Deepseek v4 flash for fast, long-lasting translations. Or check out some public Deepseek-enabled sites, like the ones I listed in some current free APIs.
I’ve recently tried Peiduwa and realized how fast translation can actually be! Immersive Translate, who are you? Don’t bother me anymore, Peiduwa is all I need.
Bitwarden
Bitwarden Extension
Also in the extension store, Bitwarden makes it easy to save your identity info, bank cards, account passwords, and security keys, plus autofill—it’s a must-have for anyone on the web. The earlier you use it, the better, and once you start, you won’t stop. For advanced users who want 2FA storage, you can self-host a vaultwarden server (How to self-host a vaultwarden), or use a free service like Disroot intro.
GlobalSpeed
GlobalSpeed Extension
Available in extension stores, this tool lets you easily adjust playback speeds—very useful for ‘speedrunning’ online courses (lol).
SimilarSites
SimilarSites Extension
With Similarsites.com - Easily Explore alternative websites, you can download the extension and, for example, discover more fun sites like youxiaohou using the extension. It’s a great way to find resources and explore the web.
WebRTC Control
Enabled State
Disabled State
A must-have for accessing sites from abroad, this extension helps hide your real IP address and is easy to toggle—just click to enable or disable.
ALL API HUB
ALL API HUB Extension
Aggregates new-api sites, checks in automatically, and tracks your balance—no more daily manual check-ins!
Superpower ChatGPT
Superpower ChatGPT Extension
Find it at https://spchatgpt.com/. With this extension, you can use Enter for line breaks and Ctrl+Enter to send, plus there’s an advanced model switcher for custom models, and handy features like dialogue export, category, and prompt saving.
Voyager
Voyager Extension
Similar to the above, but Gemini-based. Also packed with features and super useful.
End
That’s all for now! If I find more great extensions, I’ll update this post. If this helped you, I’m glad! (≧∇≦)/